iRainy Plug-in Wireless Doorbell Remote Control 300 Feets Door phone and Push Button with 36 Different Chimes Led Indicator Easy installation, plug and play, wire free and environment friendly, plug in socket and function normally; Optional computer 36 first 24 chords in music, the built-in function, stereo speakers, make the sound more crisp and sweet; Super remote distance, up to 300 Feets, and satisfy all kinds of home furnishing, office buildings, hotels, factories, tourism and high-rise office buildings; Simply plug receiver into the outlet (Voltage: 120V), LED light flashing while ringing; The button of transmitter is designed to be durable. Light touch can work on it;