DOORBELL POWER -18V universal US power cable powers popular smart doorbells, plugs into your standard 120 v outlet and converts to 18 volt 500 ma AC current.Compatible with smart doorbells:Ring, Nest Hello, Wyze, Eufy Video Doorbells and Ecobee,Sensi,Nest,Honeywell etc. UL LISTED- A certificated safety adapte, offering long-lasting performance and peace of mind for your smart home setup. Consistent and Reliable Power Supply: Low battery” issues is solved. The adapter is a quick and convenient way to charge your smart doorbells continuously. Now get rid of all battery issues and with no more interrupt or any safety concerns. EASY TO INSTALL -Plug-and-play installation.No tools or expertise required! Easily connect the doorbell adapter cable to your device for a hassle-free setup, saving you time and effort. NOTE - Please confirm that the voltage and current required by the doorbell or thermostat match the power supply. Please connect the doorbell before connecting the power supply, and be careful not to let the two cables connected together cause short circuit Ring Doorbell Charger,18VAC UL Certified Power Adapter Compatible with Ring, Nest Hello, Wyze, Eufy Video Doorbells and Ecobee,Sensi,Nest,Honeywell, 29.5ft Charging Cable