18V 500mA Doorbell Transformer, Video Doorbell Power Adapter for All Versions of Ring Doorbell, Nest Hello and Other Video Doorbell,Power Supply with 8M (315"") Long CableAbout this item --Compatible Devices:Compatible with Ring,for Nest, etc. video doorbell, no need to remove the original battery, just connect the 18V500MA doorbell adapter to your video doorbell to charge your device for a long time and keep it charged.Note: The brand above is only for demonstrating compatibilityyy --plug in transformer: new upgrade design, which completely solves the noise problem during use, and the 18V500mA stable output makes your visual doorbell work perfectly and normally,No equipment connected, directly tested with a multimeter AC No-load voltage; 23.5V --EASY INSTALLATION :Assemble along the wall from your outlet to the doorbell without the existing wiring. Super easy to install that can be able to set up in minutes --High quality material: The housing is made of PC fireproof materiy