No Battery Required Wireless Doorbell, Waterproof Doorbell Set, Front Doorbell Battery-free with 1 Receivers & 1 Self-powered Transmitter, 45 Melodies and 4 Volume Levels

【BATTERY FREE】Transmitter is converting the energy from finger press, easy to get rid of the worry about changing batteries, more conveniently and more environment friendly. the working voltage can reach AC85-260V（Wide voltage） of the Receivers
【Easy installation】This waterproof wireless home doorbell is paired before delivery, simply plug the doorbell receiver into a socket and attach the doorbell transmitter to the outside wall or door frame with the included screws or adhesive pad and it is ready to use.
【Long Distance】This high-frequency electronic doorbell uses FM signal pattern, which has strong anti-interference ability and one-to-one signal adjustment. No need to worry about poor connection to the next door signal. And the detection range can reach 200 meter in an unhindered environment.
【Durable 】This wireless bell is IP44 waterproof to withstand the toughest weather conditions. Tested at temperatures from -20 to 65°C. design service life of 20 years.
【Selection of ringtones 】The bell receiver has 45 melodies and 4 adjustable volumes from 0 to 110 dB. the bell receiver remembers the set ringtone and the set volume after a power failure, so you do not have to reset your previous settings.