Please re-install the battery in the transmitter before using the doorbell. Package includes:1 x transmitter1 x EU plug receiver1 x sticker2 x screws1 x user manual Description:100% brand new and high qualityRemind you the coming of your guests by lovely songs and LED light.Simple， wireless installation， avoid troubles and save money.Remote control range up to 100m in the open air， suitable for homes and high-rise building.All day long anti-interference system， avoid interferences outside or between neighbors.Waterproof design， you can install it on your gate without worrying about the rain.With this smart doorbell， you will never miss any guests!With 1 remote control (transmitter) and 1 receivers.Specifications:Color: blackRemote control area: �R100mTemperature resistance: -10��~50��Input:110VSize:105*83*65mmWeight:152gTransmitter:Operating frequency: 315MHZWorking Voltage: 12V (battery type: 23A 12V not included)Operating current: �Q15mAReceiver:Tones Kinds: 36 songsOperating frequency: 315MHZVoltage: AC 110VOperating current: ��120mAQuiescent current: ��120mA(220V)Power: �Q2WControlled volume: 25-80dBPlug: EU plug Quantity: 1 set (as picture show)Note: Due to the difference between different monitors， the picture may not reflect the actual color of the item. Thanks for your understanding.