24Volt Transformer C Wire Adapter for Thermostat and All Versions of Ring Doorbell, Compatible with Nest 1st/2nd, Ecobee, Honeywell, Sensi, Sensi Smart WiFi Thermostat, Nest Hello Doorbell Supply Cord

AMAZON, this is why you get all of my MONIES. I FINALLY found the correct item to keep my Ring Doorbells charged without baboon to take them down every month to charge. I've bought solar panel after panel just to return them and I was at my wits end then I came across these. They work perfectly. Easy to install, just plug in any regular wall socket. No mos power supply. Durable, I got the 26in so more then enough wire length to run from Ring to plug.

Works exactly as needed :)

This C adapter was used with a Sensi Wi-Fi thermostat ST 55 in a 125-year-old house. I had used just batteries before to bring in the Internet, but at times it was on and off. Since putting this adapter in everything works perfectly.

I needed a C wire for my Google thermostat. This plugs into an outlet so no need to run the wire to your furnace. So far so good. It doesn’t come with a wiring Diagram. I had to do some internet searches for that.

The media could not be loaded. It works as intended. Unbelievable!. Successfully adds a C wire to a two wire systemUsing it for Honeywell wifi heating only system

This adapter uses extremely thin stranded wire that does not make reliable contact with Nest's terminals. Even when properly delivering 24V AC, the connection is unstable or rejected. Avoid if you're powering a smart thermostat without a C wire.

worked with amazon thermostat

I order this transformer for the 2nd time. 1st one worked great with my Ring doorbell.2nd transformer didn't work and shorted out my Ring. While they refunded the cost of the transformer, I now have to purchase a new Ring doorbell. Amazon nor the seller was willing to compensate any money towards buying another Ring doorbell. 😟