This is a 38 Tunes Remote Control Digital LED Wireless Door.This Wireless Door Bell intercom system that lets you hear a person calling at your door before you open it. When visitors press the remote button, the Wireless Door Bell will give wonderful music. The LED Door Bell all appears to be ingenious. Digital doorbell, wireless doorbell, do not interfere with each other. LED indicator press the send button, LED indicator light will flash, emitter work. The receiver receive the order and then send out the beautiful music reminded you. The VIP visit, the blue-ray LED of the receiver will regular flash along with the music. Music source 38 songs supply for choice, Use the External button "up/down" to finish.Time to get one this Wireless Doorbell!