1.digital doorbell,wireless doorbell,Do not interfere with each other2.The work voltage of the receiver:DC3V ,Batteries Model:AA R6P×23.Static electricity of the receiver0.45mA(Ultra-low power ,can extend battery life)4.Work Frequency 315MHz or 433.92MHzrequested by customers5.Remote Control /Incept Distance120m(in open air)6.Work Voltage of the Emitter12V(Battery Model23A12V)7.Work Electricity of the Emitter15mA(20 times a day by calculating,a high qualitybattery can use for a year)8.LED Indicatorpress the send button,LED indicator light will flash,Emitter workand the receiver receive the order and then send out the beautiful music reminded youthe VIP visit, the blue-ray LED of the receiver will regular flash along with the music.9.Music source38songs supply for choice, Use the External button "up/down"to finish.(the music include AsiaEuropeAmericas famous songs,also has 10 songs of Arab MusicConcert which the Middle East customers' like)10.The function of volume regulatehighmiddlelow three volume can choice,Use theExternal switch(or button)to finish.