Feature●【Hardwired Doorbell Transformer】Input: 120V 60Hz; output: 16v 30VA, dimension: 4”x2.6”x2”.●【Universal Compatibility】The hardwired door chime transformer is compatible with Ring Pro, Nest Hello, Doorbell Pro, SkyBell Doorbell and etc. Note: the brands mentioned are only for demonstrating.●【Wirewound Doorbell Resistor】The aluminum 50W 25ΩJ resister is compatible for 1st and 2nd Gen video doobell, which can prevent voltage spikes. No more removing battery to charge.●【Easy to Install】The wire connections is very easy according to the picture shown, if you have any problems about it please contact us without hesitation.●【Package Includes】The package contains 1 x transformer and 1 x resistor.(Attention: Not all doorbells require the use of resistors, and this combination items is designed to meet the needs of more. Please check if your doorbell needs it before using it.)Description