Mini UPS Battery Backup
3.8Editor score
Multi-voltage DC output options
Compact design for easy placement
Intelligent battery level indicators
In this guide
Keeping your internet connection alive during a power outage is crucial for modern work and communication. A dedicated battery backup for modem ensures your router stays online when the grid fails.
We compared ten top-rated uninterruptible power supplies designed specifically for network equipment and home connectivity. Our analysis covers runtime, voltage compatibility, and surge protection features.
Each pick highlights unique strengths like portability or extended runtime for different home setups. Prices fluctuate frequently so always check the current listing before making your final purchase decision.
Top 3 Picks for Best Battery Backup for Modem
CyberPower CP1500PFCLCD
4.5Editor score
Pure sine wave output technology
Multiple protected AC outlets
Color LCD status panel
CyberPower CST135UC
4.9Editor score
Network and coax protection
Extended runtime at half load
Energy efficient bypass design
Top 10 Best Battery Backup for Modem in 2026 Compared
This side-by-side comparison details the key specifications and capabilities of every featured uninterruptible power supply unit for your home network needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
CyberPower CP1500PFCLCD
1500VA 1000W capacity
PFC Sinewave output
12 NEMA outlets total
Automatic Voltage Regulation
4.5Editor score
Editor's Choice
Mini UPS Battery Backup
Supports 5V 9V 12V
Compact mini design
Multiple DC output ports
Short circuit prevention
3.8Editor score
Best Premium
CyberPower EC850LCD
12 NEMA outlets total
ECO mode functionality
Multifunction LCD panel
Surge protection included
4.4Editor score
CyberPower CP1500AVRLCD3
1500VA 900W output
Simulated sine wave
12 outlets total
Color LCD display
4.5Editor score
CyberPower AVRG900LCD
900VA 480W capacity
Data line protection
12 outlets total
Automatic Voltage Regulation
4.6Editor score
Mini UPS Battery Backup
8800mAh capacity
Up to 5 hours runtime
Multiple DC outputs
Battery power indicator
CyberPower CST135UC
1350VA 810W output
Network coax protection
10 outlets total
Energy Star certified
4.9Editor score
banapoy Mini UPS
8800mAh battery capacity
Up to 5 hours power
Multiple output ports
Multi-layer protection
Sorandy Mini UPS
Gigabit POE support
Multiple voltage inputs
Compact portable design
Intelligent monitoring
3.0Editor score
UPS Battery Backup
Multiple voltage outputs
POE support included
Compact portable design
Replaceable battery
2.6Editor score
1. CyberPower CP1500PFCLCD – Best Overall Battery Backup for Modem
CyberPower CP1500PFCLCD
Pure sine wave output
1500VA 1000W power
12 outlets with USB
3-year warranty included
This unit leads our list as the Editor's Choice for its robust performance and high quality build standards. It delivers a pure sine wave output that is essential for modern active PFC power supplies found in many network devices today. Users report exceptional reliability during outages with ample runtime for safely shutting down systems. The multifunction color LCD provides clear real-time status updates on battery life and load conditions making monitoring straightforward for everyone.
Pros
- Provides stable pure sine wave power
- Large capacity for multiple devices
- Includes USB charging ports
- Comprehensive LCD display info
- Strong surge protection rating
Cons
- Larger physical footprint
- Higher price point
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The 1500VA 1000W capacity ensures it can handle heavy loads including routers modems and computers simultaneously without strain. Automatic Voltage Regulation corrects minor power fluctuations without switching to battery which extends battery life significantly over time. Six outlets are battery backed while six more provide surge protection offering flexible connectivity for all your home office equipment. The inclusion of USB ports allows you to charge phones directly keeping communication lines open even when the power is out.
While this unit is physically larger than mini DC UPS options it offers a more comprehensive solution for whole desk setups. The price is higher but justified by the superior output quality and extensive connected equipment guarantee that covers up to half a million dollars. The weight might be a consideration for small shelves but the stability of the pure sine wave output makes it worth the space required in your home network center.
Anyone with high-end networking gear or a home office needing reliable power should consider this top tier option immediately. It is best suited for users who want peace of mind regarding power quality and longevity of their sensitive electronics during storm seasons. The combination of capacity features and warranty makes it a smart investment for long-term connectivity needs.
Pure Sine Wave Technology
This feature ensures compatibility with sensitive electronics that require clean power signals to operate efficiently without overheating or damage.
Comprehensive Surge Protection
With a high joule rating this unit shields your modem and router from dangerous voltage spikes that could otherwise destroy internal components.
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2. Mini UPS Battery Backup – Best Budget Battery Backup for Modem
Mini UPS Battery Backup
Supports 5V 9V 12V
Compact mini design
Multiple DC output ports
Short circuit prevention
This compact mini UPS offers an accessible entry point for those needing basic backup for specific DC powered devices like routers and cameras. It supports multiple voltages including 5V 9V and 12V which covers a wide range of common home networking equipment needs. The small form factor allows you to place it discreetly near your modem without cluttering your space significantly. While it lacks the capacity of full AC units it fulfills its role as a targeted backup for keeping internet connections alive.
Pros
- Affordable price point
- Multiple voltage outputs
- Small and lightweight
- Easy setup process
Cons
- Lower capacity compared to AC UPS
- Not suitable for all devices
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Intelligent safeguards protect your equipment from short circuits and overcharging ensuring safe operation even when left unattended for periods. The battery level indicator lights give you visual feedback on remaining capacity so you know when to conserve power or charge the unit. It is designed to seamlessly switch to battery power during an outage preventing any interruption to your WiFi signal or data stream. The versatility in output ports means you can power various small electronics with a single device efficiently.
As a budget option it naturally comes with limitations on runtime and total power output compared to larger systems. It is ideal for specific use cases where only the modem and router need power rather than an entire workstation setup. The lower cost makes it an attractive add-on for homes that already have a main UPS but need extra coverage for specific devices or rooms.
Consider this unit if you want a cost-effective way to maintain basic internet connectivity during short outages. It is perfect for renters or those with limited space who cannot accommodate a large tower UPS. The multiple voltage support makes it a versatile choice for diverse small electronic devices around the house.
Multi-Voltage Output Support
The ability to switch between different DC voltages allows one device to serve various needs from cameras to routers without extra adapters.
Compact Footprint
Its small size ensures it fits easily on top of shelves or behind furniture where space is at a premium.
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3. CyberPower EC850LCD – Powerful Battery Backup for Modem
CyberPower EC850LCD
12 outlets total
ECO mode functionality
Multifunction LCD panel
Surge protection included
The EC850LCD stands out with its ECO mode feature which automatically cuts power to peripherals when computers are off to save energy. This functionality makes it an excellent choice for energy-conscious users who want to reduce wasted electricity without sacrificing protection. It provides six battery backed outlets and six surge protected ones offering a balanced split for your networking and office gear. The multifunction LCD panel ensures you are always aware of battery health and load status at a quick glance.
Pros
- ECO mode saves energy
- Reliable battery backup
- Clear LCD display
- Strong surge protection
Cons
- Medium size footprint
- Simulated sine wave
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With a capacity designed to handle standard networking loads it ensures your modem and router stay online during most typical power disruptions. The automatic voltage regulation helps maintain a stable input voltage protecting your devices from brownouts or surges before the battery engages. The unit is UL safety certified giving you confidence in its electrical standards and durability over years of use. A strong warranty backing adds further value to this reliable mid-tier power protection solution.
While it uses a simulated sine wave rather than pure sine wave it still works well for most standard power supplies. The ECO outlets might limit flexibility if you have multiple devices that need to stay on even when a computer sleeps. However for a focused setup where saving energy is a priority this trade-off is often acceptable. The build quality remains robust ensuring long-term reliability for home office environments.
This unit is a smart pick for anyone looking to balance power protection with energy efficiency in their home network. It suits users who want clear status updates and dedicated protection for their modem and related devices. The combination of ECO features and reliable backup makes it a thoughtful choice for everyday power needs.
Energy Efficient ECO Mode
ECO outlets automatically power down when the main PC sleeps reducing energy waste and extending battery charge for critical devices.
Comprehensive Surge Protection
Surge protected outlets ensure your modem and other electronics are shielded from voltage spikes that could cause hardware failure.
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4. CyberPower CP1500AVRLCD3 – Reliable Battery Backup for Modem
CyberPower CP1500AVRLCD3
1500VA 900W power
Simulated sine wave
12 outlets total
Color LCD display
This UPS model combines a high 1500VA capacity with a user-friendly color LCD interface for detailed monitoring of your power setup. The intelligent LCD panel provides immediate alerts about battery status ensuring you can react quickly to any power anomalies or faults. It offers twelve outlets in total allowing you to plug in your modem router and other essential gear with ease. USB charging ports are integrated for convenient phone charging keeping you connected during long outages when mobile devices are vital.
Pros
- High capacity output
- Color LCD status panel
- USB charging ports included
- Automatic voltage regulation
Cons
- Simulated wave output
- Large physical size
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Simulated sine wave technology keeps costs lower while still providing adequate power for most modern switch mode power supplies. The automatic voltage regulation adjusts incoming power to safe levels without consuming battery reserves which maximizes runtime during actual outages. The six battery backed outlets ensure your network gear gets priority protection while others still receive surge protection from spikes. This balanced approach makes it versatile for both networking needs and general home office usage.
The physical dimensions are substantial so ensure you have enough shelf or floor space to accommodate it comfortably. While the sine wave is simulated it generally works fine for most modems and routers though pure sine wave is preferred for very sensitive active PFC gear. The strong warranty and equipment guarantee provide additional peace of mind regarding the longevity and safety of your investment over time.
This model fits well for users needing ample capacity and clear status visibility for their home internet network setup. It is ideal for those who value easy monitoring and flexible outlet options in their backup power strategy. The inclusion of USB ports makes it a practical daily driver beyond just emergency power situations.
Intelligent LCD Monitoring
The color display provides real-time details on battery charge and load helping you manage your power usage efficiently.
Automatic Voltage Regulation
AVR corrects low or high voltage conditions without draining the battery keeping your devices safe during grid fluctuations.
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5. CyberPower AVRG900LCD – Stable Battery Backup for Modem
CyberPower AVRG900LCD
900VA 480W output
Data line protection
12 outlets total
Automatic voltage regulation
The AVRG900LCD distinguishes itself with dedicated data line protection which safeguards your modem from surges traveling through telephone or coax lines. This specific feature is often overlooked but critical for modems that rely on external lines for internet connectivity during stormy weather. The unit delivers 900VA of power which is sufficient for running a router and modem plus a small monitor or accessory comfortably. The intelligent LCD panel provides clear readouts of battery life and runtime allowing you to plan your shutdowns effectively.
Pros
- Data line surge protection
- Solid build quality
- Clear LCD panel
- Strong warranty support
Cons
- Moderate capacity for heavy loads
- Simulated sine wave
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Six battery backed outlets ensure your network infrastructure remains powered while additional surge protected outlets protect other sensitive electronics in your room. Automatic voltage regulation helps keep your equipment safe from brownouts without wasting battery cycles unnecessarily during short dips. The build quality is consistent with CyberPower standards ensuring reliable operation over multiple years of typical home usage. Its rating reflects high user satisfaction with performance and value for the money paid at checkout.
While it is not the highest capacity unit available it covers the essential needs of most home internet setups effectively. The data line protection adds a layer of safety that pure AC outlet units might miss for DSL or cable connections specifically. Some users might prefer pure sine wave for specific high-end equipment but this remains a solid choice for general networking use cases.
Consider this model if your modem connects via coax or phone lines and you want protection from surges entering through those cables. It is a practical pick for households seeking a balance of price performance and comprehensive protection for their internet access points. The clear display and reliable output make it a trusted partner for staying online.
Data Line Protection
Protects your modem from surges traveling through phone or coax lines preventing damage to ports and internal components.
Automatic Voltage Regulation
AVR stabilizes incoming power to safe levels saving battery usage for actual outages rather than minor fluctuations.
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6. Mini UPS Battery Backup – Compact Battery Backup for Modem
Mini UPS Battery Backup
8800mAh capacity
Up to 5 hours runtime
Multiple DC outputs
Battery power indicator
This mini UPS offers a dedicated DC solution specifically designed for routers and modems with an 8800mAh battery capacity. The manufacturer states it can provide up to five hours of runtime for a typical 18W setup ensuring your WiFi remains accessible for extended periods. It supports various DC outputs including 12V 9V and 5V making it adaptable to different device requirements without needing multiple chargers. The battery power indicator keeps you informed of remaining charge levels so you know when to manage usage actively.
Pros
- Long runtime for small devices
- 8800mAh battery
- Multiple voltage options
- Portable design
Cons
- No AC outlet output
- Battery dependent setup
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Its compact size means it can sit discreetly on a shelf or desk without drawing attention unlike larger AC UPS units. You can charge this unit via USB or wall power ensuring it is ready for the next outage whenever it occurs. The intelligent protection features guard against short circuits and overcharge ensuring safety during extended standby periods. It is an excellent option for those who want a specialized backup just for their internet connectivity needs.
Since it does not provide AC outlets it cannot power devices that plug into standard wall sockets without adapters or inverters. Users must ensure their modem router uses compatible DC voltage and plug shape for direct connection. The capacity is generous for small devices but may not support high power networking gear for as long as an AC unit would.
Choose this unit if you want a small reliable backup that targets your internet connection specifically. It is great for travelers or small apartments where space is tight and basic connectivity is the primary goal. The multiple voltage support adds versatility for other small electronics around the home.
Extended Runtime Capability
With 8800mAh capacity this unit ensures your modem and router stay online for hours during unexpected power failures.
Multiple DC Outputs
Support for 5V 9V and 12V outputs means one device can power different electronics without needing separate backups.
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7. CyberPower CST135UC – Best Premium Battery Backup for Modem
CyberPower CST135UC
1350VA 810W output
Network coax protection
10 outlets total
Energy Star certified
With an outstanding rating this premium model delivers top tier power protection specifically engineered for network and home office environments. It features dedicated network and coax ports to shield your modem from surges entering through internet cables alongside standard AC protection. The simulated sine wave output provides stable power for your router while the high VA capacity ensures ample runtime for safe shutdowns or extended use. Its Energy Star certified design minimizes power consumption making it an efficient choice for 24/7 uptime scenarios.
Pros
- Top tier protection features
- Network and coax ports
- Excellent user ratings
- Energy efficient design
Cons
- Higher price range
- Weight and size
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The versatile connectivity includes ten outlets five of which are battery backed allowing flexible placement of your modem and associated devices. Advanced protection systems guard against EMI and RFI interference ensuring your signal quality remains high during operation. Management software is included allowing you to monitor status and configure settings from your computer for total control over your power environment. The build quality justifies the investment with reliable components built to last through many storm seasons.
As a premium option it is larger and heavier than mini DC units requiring dedicated space near your networking gear. The higher price reflects the additional features like line protection and efficiency but remains competitive for what you receive. While it uses simulated sine wave the high quality construction ensures it works well with most modern networking equipment without issue.
This unit is the ultimate choice for power users who need complete protection for both power lines and network cables. It is ideal for home offices where uptime is critical and network integrity is just as important as electrical stability. Consider it if you want a comprehensive solution that handles all angles of your connectivity vulnerability.
Network Coax Protection
Surge protection covers your internet cables shielding your modem from data line spikes that could cause outages.
Energy Star Efficiency
Certified to reduce energy consumption while idle helping you save on electricity bills without losing protection.
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8. banapoy Mini UPS – Portable Battery Backup for Modem
banapoy Mini UPS
8800mAh battery capacity
Up to 5 hours power
Multiple output ports
Multi-layer protection
The banapoy Mini UPS is designed to keep your WiFi router and cameras running with an 8800mAh battery capable of five hours runtime. Its portable form factor allows you to move it easily between rooms or take it on trips where reliable internet is essential. Multiple output ports offer flexibility to connect different devices securely without needing a complex setup. A visual power indicator ensures you always know the current charge level at a glance to prepare accordingly.
Pros
- Portable and compact
- High battery capacity
- Easy setup
- Multiple device support
Cons
- Limited to DC devices
- No surge protection for AC
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Safety features include multi-layer protection against short circuits and overvoltage protecting your equipment from harm during power events. The plug design aligns with standard US outlets making setup intuitive for most home networks immediately upon arrival. It is an effective dedicated backup specifically for DC powered devices ensuring your internet remains active without large AC units. Users appreciate its quiet operation and lack of heat generation during standby periods.
This model is strictly for DC output devices meaning you cannot plug standard AC wall sockets directly into it. You must verify your modem router voltage requirements match the output options available on the unit. While limited to DC it excels in its specific role as a compact reliable backup for essential internet gear anywhere.
Select this unit if you need a simple reliable backup for your router that fits easily into a small space. It is excellent for renters who move often or for specific rooms where a full UPS would be overkill. The high capacity and portability make it a smart addition to any connectivity toolkit.
High Capacity Battery
The 8800mAh battery ensures your modem and router stay online for hours keeping your connection alive during storms.
Portable and Lightweight
Its small size allows for easy transport to different locations or compact spaces without taking up valuable shelf area.
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9. Sorandy Mini UPS – Gigabit Battery Backup for Modem
Sorandy Mini UPS
Gigabit POE support
Multiple voltage inputs
Compact portable design
Intelligent monitoring
The Sorandy Mini UPS offers a distinct advantage with Gigabit POE support ideal for powering network switches or cameras over Ethernet cables. It includes multiple DC outputs ranging from 5V to 48V covering a wide spectrum of networking devices and smart home tech. The replaceable battery design extends the device lifespan allowing you to swap the power source as needed rather than replace the whole unit. Intelligent monitoring safeguards your equipment against overheating or overcurrent conditions for safe operation during critical outages.
Pros
- Supports Power over Ethernet
- Multiple voltage outputs
- Compact size
- Replaceable battery option
Cons
- Mixed user reviews
- Complex setup for POE
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This compact unit is designed to be portable and fit into various setups without significant space requirements. It is well suited for users who have POE devices like security cameras that need uninterrupted power alongside standard modems. The replaceable battery feature adds long-term value by maintaining usability without a complete unit replacement after years of use. Setup requires checking voltage compatibility but offers high flexibility once connected correctly.
User feedback on this model is mixed with some noting performance issues or complexity in setting up the POE features. It is important to verify your devices support the specific POE standards before purchasing to ensure smooth operation. While it offers unique capabilities it requires more technical know-how compared to standard plug-and-play units.
Consider this unit if you run POE switches or cameras and need a compact solution that can handle higher voltage needs. It is best for advanced users who want replaceable components to extend the life of their backup system. Ensure you match all voltage requirements carefully for the best experience.
Gigabit POE Support
Allows you to power network switches and cameras directly over Ethernet cables simplifying your wiring needs.
Replaceable Battery Design
Extend the life of your unit by swapping out the battery when needed instead of buying a new backup system.
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10. UPS Battery Backup – Versatile Battery Backup for Modem
UPS Battery Backup
Multiple voltage outputs
POE support included
Compact portable design
Replaceable battery
This versatile unit offers multiple voltage outputs including POE options to keep your router and modem running during unexpected outages. It supports various DC voltages like 5V 9V and 12V alongside POE outputs ensuring broad compatibility with different devices. The replaceable battery feature allows you to maintain the backup power capacity for years by swapping out the power cell. It comes equipped with comprehensive safety guards against overheating overvoltage and overcurrent to protect your expensive electronics from harm.
Pros
- Multiple voltage options
- Portable and compact
- Replaceable battery feature
- Comprehensive safety guards
Cons
- Lower user rating
- Setup complexity
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Its compact design makes it easy to carry and place in tight spaces near your network equipment without clutter. The unit is lightweight enough to take on travel ensuring you have internet backup whether at home or working remotely. The setup involves connecting the correct cable and ensuring battery installation which adds a step for first-time users. Safety is prioritized with flame retardant housing and monitoring systems that prevent hazards during operation.
User ratings suggest there may be some learning curve or inconsistencies with performance compared to higher rated models. It is important to check current availability and compatibility before buying to ensure it fits your specific modem requirements. While feature rich the lower rating indicates potential quality control or usability issues to be aware of.
Choose this unit if you need a portable POE capable backup for specific setups where other models lack flexibility. It works best for tech savvy users comfortable with checking voltage compatibility and installing batteries. The replaceable battery design offers good value for long-term use when setup is successful.
Multiple Voltage Output
Supports 5V 9V 12V and POE outputs to fit a wide range of devices beyond just standard routers and modems.
Replaceable Battery Design
Swap out the battery when capacity drops to extend the lifespan of your backup unit without a full replacement.
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Buying Guide – How to Choose the Best Battery Backup for Modem
Selecting the right power backup requires understanding your device needs and the type of protection your home requires during outages.
Output Voltage Compatibility
Ensure the backup matches your modem router voltage requirements. AC UPS units provide standard wall outlet power while mini DC units match specific low voltage devices directly.
Always check your device label for voltage specs before buying to guarantee a seamless connection.
VA Rating and Capacity
Volts Amps VA rating determines how much load the battery can handle. Higher VA means more outlets and longer runtime for multiple devices.
Pick a VA rating that exceeds your total device wattage by a safe margin for reliability.
Waveform Type
Pure sine wave output is ideal for active PFC power supplies found in high end network gear. Simulated wave is acceptable for most standard devices.
Choose pure sine wave for sensitive equipment to avoid overheating or performance issues.
Runtime Expectations
Run time varies by load size battery condition and unit type. Mini DC units might offer hours for single devices while large UPS units offer minutes for shutdowns.
Set realistic expectations based on your specific devices and out duration needs.
Surge Protection Rating
Joule rating indicates how much surge energy the unit can absorb before failing. Higher joules offer better protection against dangerous power spikes.
Look for at least 600 joules for basic coverage and over 1000 for premium protection.
Form Factor and Portability
Mini UPS units are small enough for shelves whereas tower UPS units require floor space. Consider your available space and need to move the device.
Choose compact designs for small apartments and towers for home office desks.
Warranty and Support
A solid warranty ensures the battery and parts are covered for replacements if they fail early. Look for terms covering at least three years of service.
Verify that the battery itself is included in warranty coverage for full protection.
Data Line Protection
Some UPS models offer coax or phone line protection which is critical for modems using those connections. This prevents surges from traveling through your network cables.
Prioritize data protection if your modem connects via coax or phone lines directly.
How to Use and Care for Your Battery Backup for Modem
Plug your modem and router into the battery backed outlets of your UPS and ensure the unit is connected to a wall power source. Allow the device to charge fully before expecting full backup power during any outages.
Keep the backup in a cool dry place away from direct sunlight or moisture to preserve the battery health and performance. Regularly check the indicator lights to ensure the unit is functioning correctly and ready for use.
Test your UPS every few months by unplugging it briefly to verify that it switches to battery power without disrupting your internet connection. Replace the battery when runtime drops significantly to ensure continued protection for your network gear.
Frequently Asked Questions
Do I need a battery backup for my modem?
Yes a battery backup ensures your internet stays online during power outages which is vital for remote work and safety. It protects your router from unexpected shutdowns and prevents the need to reset equipment after a blackout.
How long will a mini UPS last during an outage?
Mini UPS units typically provide 2 to 5 hours of runtime depending on their battery capacity and the power draw of your modem. Higher capacity models like those with 8800mAh batteries will last longer than smaller alternatives.
What is the difference between AC and DC UPS for modems?
AC UPS units plug into standard wall outlets and power your modem through a power adapter whereas DC UPS units connect directly to the device voltage. AC units offer more flexibility while DC units are more compact and energy efficient.
Can a battery backup protect my modem from power surges?
Many UPS models include surge protection features that shield your modem from high voltage spikes during storms. Always check the Joule rating to ensure your specific unit offers sufficient protection for your electronics.
Does the battery need replacement over time?
Yes the internal battery of a UPS will degrade over time and typically needs replacement every 3 to 5 years. Look for units with replaceable batteries to maintain performance and avoid replacing the entire system.
Do I need a UPS if I have a generator?
Generators do not respond instantly to power failures so a UPS provides necessary bridge time during switchover. It also stabilizes power quality which generators alone might not provide consistently.
Can I charge my phone with a UPS backup?
Many modern UPS units include USB ports that allow you to charge phones and tablets directly during outages. Check the unit features to confirm USB charging capabilities are available on your model.
Is a UPS loud during operation?
Most modern UPS units operate silently in normal conditions but might beep when switching to battery power during an outage. Mini DC UPS units generally produce no noise at all since they lack fans and large transformers.
Final Thoughts on Choosing the Best Battery Backup for Modem
We have reviewed ten top rated options ranging from compact mini DC units to full AC UPS systems for reliable internet backup. The CyberPower CP1500PFCLCD leads as the Editor's Choice for its superior performance and pure sine wave output quality.
Your choice should depend on whether you need whole desk protection or just a specific backup for your modem and router. Consider capacity waveform type and surge protection to match your unique home network requirements effectively.
Prices for these units fluctuate so always check current listings before purchasing to ensure you get the best value available. Verify compatibility with your modem router voltage needs to avoid connection issues upon arrival.