Best Wired Door Bell Transformers in 2026

WIDELY USE: US power cable Powers your popular smart thermostats((Nest, Ecobee, Honeywell, Sensi) and doorbells(Ring Video Doorbell, Ring Video Doorbell 2 & Ring Video Doorbell Pro,Nest Skybell , etc.) and other devices that require constant 24 volt power for operation, enables you to charge your devices safely.

EASY TO USE:Assemble along the wall from your outlet to the doorbell and thermostat without the existing doorbell or wiring. Easy installation and be able to set up in minutes.

LONG CABLE:Our cable is 8M(315 inch) long and you do not worry about the distance between the socket and the Honeywell Smart Wifi Thermostat. This allows you to easily plug it into an electrical outlet inside or outside your house.

【Power Multiple Thermostats/Doorbells】Replace and upgrade underpowered transformers with this 24V AC Transformer, while providing ample power to single or multiple thermostats and doorbells

【Specification】Input: 120 V/AC, 60 HZ; Output: 24 V AC at 40 VA, reliable performance and safe to use

【Wide Applications】Compatible with most brands of doorbells or thermostats, low voltage hardwired doorbell power supply for residential, commercial and industrial use

Power up multiple thermostats and doorbells: replaces and upgrades underpowered transformer with this 24V transformer, offering plenty of power for single or multiple thermostats and doorbells at the same

Universal compatibility: this 24 volt transformer compatible with Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation

SPECIFICATION: Input is 120 Volt, 60 HZ; Output: 24 Volt/ 40 VA; Tip: The load voltage(when the doorbell is running) is 24V and the output of no-load voltag is about 27V

CHIME WITH TWO SOUNDS: Classic two-note “Ding Dong” sound for the front door button and has an additional connection with a separate "Dong" for the rear or side door

DIMENSIONS: Cover: 9” W x 5” L Base: 7-1/8” W x 4-5/8” L

16-VOLT, 30VA DOORBELL TRANSFORMER: For powering up to three hardwired doorbell chimes or modern smart video doorbells

【Widely Use】: Compatible with doorbell like Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell, smart doorbell, Nest Hello doorbell, etc., also compatible with smart thermostats like Nest, Ecobee, Honeywell, Sensi, Hive, etc. and other devices that require constant 24 volt power for operation, enables you to charge your devices safely.

【Certificated Safety C Wire Adapter】: Hotop doorbell transformer is UL listed and has built in 2A thermal fuse short circuit protection, prevent short circuit, overvoltage, overcurrent, overheat, ensure charging safety.

【Safe and Convenient】: A quick fix to the problem of "Low batter" you can charge it directly (plug adapter into outlet and power up). that means you don't need to remove your thermostat in order to charge up the battery. With an output of 24V/300mA, a ncie tool to meet your needs.

Replace your underpowered doorbell transformer.

Optimize the performance of your Video Doorbell Wired, Video Doorbell Pro, Video Doorbell Pro 2 with increased power.

Easily replaces most North American doorbell transformers.

The only power supply engineered to work with the Nest Hello video doorbell. Built with special electronics to protect your bell in case of a short - no need for an existing doorbell, new wiring or separate resistor.

Equipped with ONE TOUCH POWER TEST (patent pending) - the easiest way for anyone to check their power supply. No tools or equipment needed.

Professionally designed and tested to power the full functionality of your Nest Hello. All components are robustly engineered to provide years of trouble free operation.

【AC 18V 500mA】: Input :AC120V, 60Hz. Output: AC18V, 500mA. Length: 16.4ft (500cm). Compatible With: Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Hello Video Doorbell,for Zmodo smart greet wifi doorbell.

【Connecting You Doorbell Ring】: This Power Supply Adapter for the Ring can connect you Ring Video Doorbell to the power adapter directly,forget the hassle of charging your battery and let your Ring continuous operation.

【Easy Installation】: Assemble through door hole and simply connect the wire to your Ring,install and setup can be completed in a few minutes,no need for an existing doorbell or new wiring,can be installed on any door.

FEATURES：18V Doorbell Power adapter, plugs into your standard 110 v/120 v outlet and converts to 18 volt 500 ma AC current.

INSTALL :Connect the two ring terminals to the screws at the back of the doorbell. The wire ring design makes it easier to install and helps ensure the adapter is firmly connected to the doorbell. The wires are sturdy and flexible enough not to be easily torn.

COMPATIBILITY:Replacement for all video doorbell, compatible with Ring Video Doorbell Pro, Nest Hello, etc. ; Note: the brand mentioned above is only for demonstrating compatibility.

Doorbell/Thermostat power solution: 24Vac 40VA wall transformer, using this Transformer to replace and upgrade the insufficient power transformer, can provide sufficient power for your thermostat and doorbell, save the trouble of frequent battery replacement

Specification: input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA ,No-load output voltage: 26.6V,SAFE AND STABLE auto-resetting (PTC) fused secondary, LED green power indicator

Compatible With: This transformer compatible for Honeywell, Nest, Ecobee, and Sensi smart thermostats; Also compatible with Video Doorbell, Video Doorbell 2, Video Doorbell Pro, Nest Skybell Doorbell

This 24v adapter/transformer Powers all smart wifi thermostats and doorbells from makers of Nest, Ecobee, Honeywell,Smart doorbell, Doorbell pro, Skybell, and more

Extra Long 26 foot cable for long distance wiring, Install your Video Doorbell without worrying about existing doorbell wires at home

Extremely long life-3 Years Warranty & Service. UL, FCC, Class 2, RoHS Certifications.

MULTIPLE USAGES - A device you could use for both doorbells and transformers, 24 Volt transformer can be also used for multiple thermostats and doorbells, offering plenty of power for single or multiple devices (2-3) at the same time.

MORE STABLE CONNECTION - Greater power connection, higher load and longer service life of products. XX type pure copper wire has a small difference in conductivity and more stable current, which is 10% more wire usage than common inverters. Allows more stable charging connection for 2-3 devices at the same time.

DOORBELL TRANSFORMER - It's compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Zmodo Smart Greet Wi-Fi Video Doorbell and Nest Hello Doorbell, etc. Or any other devices that require constant 24V power for operation.

Powering thermostats and doorbells: replacing underpowered transformers

<p><b>[Specifications]</b> Input voltage: 120 v AC, 60 Hz Output voltage: 16 v AC at 30 VA.

<p><b>[Convenience] </b>The replacement can be completed in a short time. Tighten or screw it to the electrical box for safe handling.

✔ring plug in adapter: Our team has made a new upgrade design, which completely solves the problem of noise during use, and the 18V stable output makes your visual doorbell work perfectly and normally

★Wide range of applications: compatible with Ring, Nest, Arlo, Eufy, Wyze and other large number of video doorbell equipment

♣Long cable design: We use an 8M extension cable so you can easily plug the ring doorbell adapter into a power outlet inside or outside the house

Universal Compatibility: This 24V transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation.

Power up multiple thermostats / doorbells: Replaces and upgrades underpowered transformer with this 24V AC transformer, offering plenty of power for single or multiple thermostats and doorbells at the same time.

Eco-friendly: Eco-friendlyzinc plating technology , no pollution.

[Product specifications]: 16V 30VA doorbell transformer: low voltage hardwired door chime transformer, Primary Input: 120V AC 60Hz, Secondary Output: 16V AC 30 VA, Class B insulation, Class 2 transformer

[Compatible with]: For use with many doorbell transformers, Ring Doorbell, Ring Doorbell 2, Ring Video Doorbell Pro, Nest Hello Video Doorbell

[Easy to install]: screw down and thread clamps to electrical box.

16V 30 VA doorbell transformer: 16-volt, 30 VA low voltage hardwired door chime transformer

Handy use: power single or multiple door chimes in one home with ease, replace the old and under powered doorbell transformer for better performance

Input: 120V, 60 Hz; Output: 16V at 30 VA

UNIVERSAL DESIGN: US power cable Powers your popular smart thermostats((Nest, Ecobee, Honeywell, Sensi) and doorbells(Ring Video Doorbell, Ring Video Doorbell 2 & Ring Video Doorbell Pro,Nest Skybell , etc.) and other devices that require constant 24 volt power for operation, enables you to charge your devices safely.

EASY INSTALLATION: Assemble along the wall from your outlet to the doorbell and thermostat without the existing wiring. Super easy to install that can be able to set up in minutes.

CONVENIENT: With this C Wire Adapter, you could able to charge your doorbells and thermostats without any worry about interrupting, which makes it a wonderful ring doorbell transformer. You don't need to take off the battery inside the doorbells and just connect this transformer, keep doorbells charging any time you want.

HQRP® Replacement AC Adapter; ETL Listed;

Input: 120V AC; Output: AC 24V, 300mA; 25ft Cable;

Safety Features: High Efficiency and Reliability; Automatic Overload cut-off;

20V C wire power adapter: plugs into your standard 110 v/ 120 v outlet and converts to 20 volt 500 ma AC current

Doorbell transformer power supply: quality designed to compatible with wireless doorbell wireless chime arlo video doorbell, just charge directly, no need to remove and charge up the battery, convenient and practical to solve the problem of low battery

UL certified: UL certification passed, stable and durable operation 20V transformer

【Power Multiple Doorbells】: 16V 30VA door bell transformer, great replacement for existing underpowered transformer, like 10V 5VA / 16V 10VA. Sufficient power to control single or multiple doorbell and door chimes in one home.

【Universal Compatibility】: 120V AC to 16V AC, compatibles with Ring Video Doorbell Pro, Ring 2, Ring 3, Google Next Hello, Unifi G4 and other devices that require constant 16 volt power for operation.

【Easy Installation】: Twist the black screw and thread clamp to electrical box, comes with 3 wire nut for convenient wire connection. Can be also mounted on the wall. Note: Turn off your electrical breaker first.

COMPATIBILITY: Video Doorbell Transformer compatible with Video Doorbell 2020 release, Video Doorbell 2/3/3plus/4, Video Doorbell Pro /Pro 2, Video Doorbell Wired (NOT include Doorbell and Battery).

CONTINUOUS CHARGING: Doorbell power supply uses 18V 500mA AC transformer to charge the Doorbell, no need to replace the battery frequently. It is recommended to make sure the battery is fully charged before use

SATETY PROTECTING: Door bell Transformer has safety certification. Using high-quality PVC weatherproof material, it has the characteristics of weatherproof, overcurrent protection, overvoltage protection, and short circuit protection. Protect your property and personal safety.

Wide Compatiblity: Power your Doorbells (Ring, Nest, Arlo, Eufy, Wyze, Ring 1/2/2 Pro/3/3Plus/4/Pro, HLT, SimpliSafe, Ecobee, Sensi, Blink Video Doorbell, Google Nest, Zmodo Smart Greet, Skybell August Doorbell, Security Doorbell, Arlo Camera etc.) and other devices that require constant 18 volt power for operation, enables you to charge your devices safely.

Features: Input AC 120V, 60Hz 0.2A. plugs into your standard 110 v/120 v outlet and converts to 18 volt 500 mA AC current.(black)

Easy To Use: 2 pin non-polarity wires support easy and quick install, Assemble along the wall from your outlet to the doorbell without the existing doorbell or wiring. 26ft (8M/315 inches) extra long cable

✅This 24 Volt transformer is UL-certified, offers reliable performance

✅Input :120 VAC, 60 Hz; Output: 24 V/ 40 VA

✅Easy to install: screw down and thread clamps to electrical box

Upgraded 24V Doorbell Transformer - With the upgraded system, the new adapter is more stable and without noise during use. Continuously transfer 110/120v to 24volt Make your doorbell works more stable and safe.

Wide Compatibility - This plug in adapter is compatible with most doorbells on the market, including Ring, Nest, Arlo, Eufy, Wyze and others.

Low Battery Issue is Solved - The adapter is a quick and convenient way to charge your smart doorbells continuously. Now get rid of all battery issues and with no more interrupt or any safety concerns.

Hardwired Transformer: Input: 120v AC 60Hz; Output: 16V AC 30VA

UL Registered: the doorbell transformer has passed the UL certification; Safe and long lasting

Class B Insulation: the long-term operating temperature of the 24V transformer is 130 degrees Celsius/ 266 degrees Fahrenheit and will not break the doorbell and thermostat due to excessive temperature

【Specification】Input: 120 V 50/60HZ; Output: 24 V 40VA, this 24 volt transformer is UL-certified, offers reliable performance and safe to use

【Universal compatibility】 this 24v transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation

【Power Multiple Thermostats/Doorbells】Replace and upgrade underpowered transformers with this 24V AC Transformer, while providing ample power to single or multiple thermostats and doorbells（Perfect replacement for an old transformer and will work with any wired door chime）

Sufficient Power Supply - 24v universal US hardwired transformer powers popular smart doorbells. Enough power out put for variaty of doorbells. Compatible with Ring video doorbell (2020 release, 3/4/plus, and pro 1/2), Nest Hello, Eufy, Skybell, Arlo, etc. Continuously converts 110/120v to 24V AC at 40VA

UL Listed Transformer - A certificated battery backup is stable and sturdy for years use. The transformer has been tested 100% safe with over current protection, overload protection and short circuit protection.

Convenient for Single/Multiple Door Chimes - “Low battery” issues is solved. The adapter is a quick and convenient way to charge your smart doorbells continuously. It is capable for single or multiple door chimes use in one house.

①US power cable Powers your popular smart thermostats((Nest, Ecobee, Sensi) and doorbells(Ring Video Doorbell, Ring Video Doorbell 2 & Ring Video Doorbell Pro,Nest Skybell , etc.) and other devices that require constant 24 volt power for operation.

② Assemble along the wall from your outlet to the doorbell and thermostat without the existing doorbell or wiring. Easy installation and be able to set up in minutes.

③ Our cable is 5M(196 inch) long and you do not worry about the distance between the socket and the Smart Wifi Thermostat. This allows you to easily plug it into an electrical outlet inside or outside your house.