24VAC 40VA Plug in Transformer,Doorbell Transformer Compatible with All of Doorbell，Nest, Ecobee, Sensi and Honeywell Thermostat

It works as expected, and it was very easy to set up — wind the wires around each terminal and screw them tight. Unlike my old "24V" adapter, this one is powerful enough to supply the juice needed to support "Pre-recording" on my Eufy Video Doorbell E340

I have three now for Ring doorbell cameras, all work well. The oldest must be well over a year old. This is a product I would expect to last for many years if not abused by overloading the output or use outdoors.

This is a great quality transformer. I had to replace a cheaper model that kept ruining my doorbell chime

I had updated my older doorbell to Google nest wired doorbell and needed a higher voltage transformer for connectivity and found this product. It worked fine and working however this 24VAC 40VA plug in transformer is a little heavier. I’m no expert and a novice but i guess since it’s a higher voltage it’s heavier hence the 4 stars.

Did the job?

Great item worth recommending

Produces too much voltage. 27.5 V. I’m afraid to use it with my video doorbell. I am concerned it will damage the doorbell.

Working great to power my 3 zone TACO SR503 switching relay setup with 3 nest power connectors. I have a two wire setup (R and W) only and this can provide power to my Nest Thermostats no problem.