Power Source:PlugDoorbell Type:WirelessColor:WhiteDoorbell type:wirelessPower source of receiver:AC 220VPower source of transmitter:No battery, Self-poweredSound:25 melodiesRemote control distance:Outdoor 100m ; Indoor 30mVolume:110dBWaterproof:IPX7Radio frequency:433.92MHzSize:83mm*83mm*8mm(transmitter)21mm(receiver) Show More