Feature: 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. Specification: Item Type: Wireless doorbell Material: ABS Door Bell Transmitter: Power Supply: Self generating Doorbell Receiver: Power Supply: AC100V-230V 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. Package List: 2 x Doorbell 1 x Receiver 2 x Sticker1 x Manual Note: Please supply power according to the voltage used. Use of other voltages may cause fire and product damage!Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.