Smart home owners, this Fesasn doorbell transformer is exactly what you need to power your video doorbell and smart thermostat! It converts your standard 120V household power to a stable 24V/500mA output that keeps your devices running smoothly. The 16.4-foot black cable gives you plenty of length to route from your outlet to your doorbell location without needing existing doorbell wiring. It's compatible with pretty much all the popular smart doorbells - Ring (including the 2020 release, 3, 4, Plus, and Pro 1/2), Nest, Eufy, Skybell, and works great with smart thermostats from Ecobee, Honeywell, Sensi too. The upgraded design eliminates noise and heat issues that some cheaper transformers have, and it includes safety features to prevent short circuits, overvoltage, overcurrent, and overheating. Installation is straightforward - just connect to your doorbell first, then plug into power (and make sure those two cables don't touch!). Fesasn has a team that specializes in transformers, so you're getting a quality product designed specifically for this purpose. If you've been struggling with battery life on your video doorbell or your smart thermostat keeps losing power, this transformer will solve those problems completely. They stand behind it with responsive customer service and a satisfaction guarantee. Seriously, if you want reliable power for your smart home devices, this transformer is absolutely worth it!