Hotop 1 Pack 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with All Versions of Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/24V Adapter

Had this for about a year and a half after lightning took out the original transformer and doorbell camera. We recently had a very close lightning strike. While looking to see what got hit I noticed the LED was out but this transformer still works and so does the doorbell camera. Very happy. Will buy again.

You'll find many doorbell/thermostat transformers on Amazon... many are underpowered. This one is not. It is hefty, and appears well-built. It can handle multiple smart thermostats (to provide the C-wire power). I recommend it, and will use it for all future C-wire/thermostat installs.

Worked just as expected with my ring doorbell pro 2

Plenty of current for most needs. Easy to install although its larger and heavier than necessary for a single thermostat. Only complaint is the fact that it gets somewhat warm. Yes, this is normal, but given the load on my application its excessive.

Very good. Returned only because it didn't fit where I wanted to use it.

Nice transformer

Over heats and stops working. Have to unplug once a month to cool it down.

I purchased the Hotop 24VAC 40VA plug in transformer to replace the 25.5VAC 25VA plug in power supply that came with my Rainbird ESP-Me irrigation controller. The original power supplies are notorious for breaking, and used ones in good condition go for $70 on EBay. The Hotop plug in transformer is a little over-rated for what the Rainbird system needed, but the Hotop was one of the very few 3 prong grounded 120VAC inputs with a 3 wire 24VAC grounded output that I was able to find to match the original Rainbird power supply. I used the 3 wire cord from the original supply and connected it to the 24VAC screw terminals on the back of the transformer case. The measured voltage output from the Hotop read 27VAC with 124VAC input from my house outlet. The original power supply (25.5VAC output) supplied 29VAC, so I'm not worried as the 27VAC is within the range of the 24VAC control valves in my system. Excellent product for an excellent price.