24V 40VA Thermostat and Doorbell Transformer, Power Transformer Compatible with Nest, and Honeywell, and Ecobee and Sensi Thermostat, Nest Hello and All Versions of Doorbells
Condition: New
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Thursday, Aug 13
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Features
- Multiple Functions: Transformer for both doorbell and thermostat,Can be used for multiple thermostats and doorbells, providing sufficient power for single or multiple devices (2-3) at the same time
- 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, and other devices that require constant 24 volt power for operation
- Easy to install:screw down or threaded clamp to electrical box
- Note: The brand above is only for demonstrating compatibilityyy
Brand: WUYELIN
Power Source: AC
Product Dimensions: 2.87"D x 2.09"W x 2.07"H
Mounting Type: Chassis Mount
Current Rating: 1.66 Amps
Brand Name: WUYELIN
UPC: 791309016525
Manufacturer: shenzhen yelinda
Specification Met: RoHS
Power Source: AC
Mounting Type: Chassis Mount
Current Rating: 1.66 Amps
Maximum Frequency: 60 Hz
Minimum Frequency: 60 Hz
Item Dimensions D x W x H: 2.87"D x 2.09"W x 2.07"H
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 13
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Learn more about financing & leasing here.
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Top Amazon Reviews
Works as expected
Reviewed in the United States on August 25, 2025 by Henry R. Tumblin
Got the dreaded "not getting enough power' message thru the Eufy app. I knew exactly what needed to be done and this little one performed flawlessly. I already knew where to find the old transformer so once it cooled off in the attic, I swapped them out. I tested with Volt meter and was getting the juice as indicated. Fairly easy swap if you can find yours and know how to turn off the power to it.
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Reviewed in the United States on August 30, 2023 by Jeff Kahlan
I used this to hook up some doorbell cameras I bought. And it worked just fine no issue. Provided enough power for both cameras. My only concern is that the connectors on the 24v side looked A little sketchy, like they we weren’t held on by much. So if you do get it just be careful when attaching the wired not to knock those fittings loose.
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Reviewed in the United States on November 16, 2025 by RObert
Installed ring doorbell and it worked for about 15 minutes until it ruined my transformer. Bought a replacement from local hardware store and funny enough it did the same thing. After speaking to an electrician he recommended getting another transformer with a higher voltage or whatever so I found this one and thought I would give it a try. And it was perfect. Fixed ring doorbell power issues and continues to work great.
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Reviewed in the United States on February 28, 2023 by Sergio D Valdez
Transformer output is 27.5 volts not the rated 24 volts. It should be OK for my use but if used with sensitive electronics it could be a problem.
Reviewed in the United States on August 16, 2020 by DB
It works as advertised. My old transformer just didn't have the power to support my Blink Video Doorbell. I was going through too many expensive lithium cell batteries. If you have a problem with video doorbell battery life, this transformer may work for you like it does for me.
Reviewed in the United States on January 17, 2023 by Alan K
After wiring this to local power and to the thermostat, we got nothing. I have missed my return window, so I will probably have to throw it out sadly.
Reviewed in the United States on May 6, 2024 by Kate Cudney
I needed a new transformer to install a new Eufy smart doorbell. This one was just as expected & provides plenty of power for the doorbell. I had no issues with install or use. Although only time will tell as far as durability, the product seems solid and works well. Wires coming out the back & screws on the front made it easy to install, along with the round mounting ring which allowed me to attach it to my existing plate easily & securely.
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Reviewed in the United States on September 25, 2020 by Deal Guy