Battery-Free Doorbell Two With Two Self-Powered Doorbell Household Smart Waterproof Wireless Doorbell

Music: 60 pieces of music (factory default Dingdong Dingdong)

Volume: 5 levels of volume (adjustable to mute)

Transmitter: No battery required, press to generate electricity

Receiver: Just plug in when the bell rings

Receiver voltage: 110/220V

Transmitter size: 70mm*46mm*24mm

Receiver size: 90mm*56mm*20mm

Remote control distance: 150M in a straight line on the open ground (data from factory laboratory)