Relay Doorbell Power Supply As Shown In The Picture 16V30VA Transformer Easy Installation High-performance PowerSPECIFICATIONS Brand Name: Keszoox High concerned chemical: None Origin: Mainland China Features: * Made of high quality materials, you can buy with confidence. * Powerful performance: can easily power single or multiple doorbells in your home, eliminate problems caused by insufficient power and replace the old doorbell's underpowered transformer for better performance. * Wide range of applications: This for ring doorbell transformer is compatible