Good Compatibility: The Power Supply Adapter is compatible with most wifi doorbell in the market, e.g: Ring Video Doorbell, Ring Video Doorbell 2 and Ring Video Doorbell Pro Nest Hello video doorbell Easy to install: Just connect the 2 copper wire tips to the screws on the bracket of the doorbell and you are ready to go. then you can operate your Ring Video Doorbell and Nest Hello Video Doorbell continuously without the need to remove your doorbell Professional Transformer: A transformer that design for Nest hello doorbell. For better applicability, the voltage and the Adapted model can be used for your Nest Hello Doorbell, RING Video Doorbell, RING Video Doorbell 2 Ring Video Doorbell Pro Supreme Quality: Our adapter is made of high-quality material with good electrical conductivity, transmission stability, and durability. Keep your doorbell charging and safe as well 5M Long Cable: Designed for easy installation and can be set up in minutes,When using the supply power adapter, please remove the battery