1. The receiver is easy to install and can be used when plugged into the power source, which is safe and environmentally friendly and does not cost electricity.2. Stick-on transmitter, one battery can be used for one year.3. 300m wireless receiving distance, strong penetration and anti-interference ability, suitable for a variety of scenarios.4. It can adjust the volume of the receiver in 3 levels and convert 38 different music.5. Transmitter/receiver is equipped with LED working indicator6. IP44-level transmitter waterproof design to prevent rainwater intrusionProduct Name: Home Wireless Waterproof DoorbellWorking range: 300mMusic selection: 38 musicVolume selection: 3 levelsPower supply mode: receiver-power supply, transmitter-battery supplyPlay mode: music selection-touch the song selection button, loop interruption setting: long press the song selection button for 3 secondsSize: transmitter-75*51*20mm, receiver 95*65*24mmScope of application: homes, offices, hospitals, restaurants, factories, etc.Waterproof rating: IPX44