18 Volt Doorbell Transformer, Power Supply Adapter, Compatible with Nest Hello Video Doorbell, Arlo and Eufy Doorbell, White Transformer with 13ft Cable Have you ever imagine that you can charge your doorbell with one tool? Choose our Fatkitt power supply adapter and you no longer need to buy batteries. HOW TO START THIS? FOR YOUR DOORBELL Keep adapter unplugged Wires connect to doorbell terminals (any wire can be connected to any terminal) Plug the adapter into the outlet Put doorbell face plate on the housing unit Power up and verify your doorbell is receiving necessary power using the accompanying application Continuously Charging Fatkitt transformer can be continuously charging your device without the worry of the doorbell powering off. Which is time-saving and work saving. Long Cable 13 ft (156 in) long cable wire allows you to wire it anywhere you want. Diode Fatkitt provides you an extra diode to meet your other assembly needs. Compatible With Nest Hello Video Doorbell Arlo Video Doorbell Eufy Video Doorbell Simplisafe Video Doorbell Skybell Doorbell Zmodo Smart Greet Wi-Fi Video Doorbell Note: the brand above is only for demonstrating compatibility. Specification Power Transformer Size: 2.5 x 1.9 in Input: 120V AC 60Hz 110mA Output: 18V AC 500mA Cable Length: 156 inch (400 cm) Cable Wire Type: Stranded copper wire