Features: 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_x000D_ Material: ABS_x000D_ Door Bell Transmitter: _x000D_ Power Supply: Self generating_x000D_ Doorbell Receiver:_x000D_ Power Supply: AC100V-230V_x000D_ Power Consumption: 0.25W_x000D_ Ringing Tones: 38 tones_x000D_ Transmission Distance: Open space 150m_x000D_ RF Frequency: 433MHz_x000D_ Ringing Volume: 50dB/1m_x000D_ Use: It can be used for family, villa, hotel, factory, elderly, patient, pregnant woman one touch call PackageList: 2 xDoorbell 1 xReceiver 2 x Sticker 1 x Manual Note: Please supply power according to the voltage used. Use of other voltages may cause fire and product damage!_x000D_ 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.