1、38 Ringing Tones: Two doorbell transmitters and one doorbell receiver can be used for front and rear doors, and separate corresponding ringtones, 38 ringtones, can also be set. 2、Battery Free: Self generating wireless doorbell, simple and beautiful, integrated with other household switches, free of wiring and battery. 3、Multipurpose: Not only a doorbell, but also a caretaker pager to meet the needs of babies, the elderly and pregnant women. It can call with one button and guard the family. 4、Long Range: Strong signal penetration. The volume is loud, which can solve the problem that the elderly can't hear. One button mute can also be set to avoid disturbance. 5、Easy Installation: The doorbell transmitter IP68 is waterproof and can extend its service life. The transmitter can be pasted or fixed with screws. Item Type: Wireless doorbell Material: ABS Door Bell Transmitter: Power Supply: Self generating Doorbell Receiver: Power Consumption: 0.25W Ringing Tones: 38 tones Transmission Distance: Open space ≥150m RF Frequency: 433MHz Ringing Volume: ≥ 50dB/1m Use: It can be used for family, villa, hotel, factory, elderly, patient, pregnant woman one touch call 2 x Doorbell 1 x Receiver 2 x Sticker 1 x Manual