Features: 1.2 FOR 1: Wireless doorbell adopts two for one design, which can be used for front and back doors, with 38 reminder tones and can set individual corresponding ring tones. 2.SELF GENERATING: Wireless doorbell button is self generating, wiring free and battery free, saving energy and making it more convenient to use. 3.IP68 WATERPROOF: Waterproof wireless doorbell is IP68 level waterproof, and it is not afraid of sunlight, sturdy and durable, and has a long service life. 4.STRONG PENETRATING POWER: Battery free wireless doorbell penetrating power, support through the wall use, support long distance signal transmission. 5.SOUND LOUD: Self generating doorbell volume is loud, solve the elderly can not hear the trouble, also can set a key silent mode to avoid disturbance. 6.MULTI PURPOSE: Waterproof mini doorbell is not only a doorbell, but also can be used as a pager for babies and the elderly, pregnant women and other people. Specification: Item Type: Wireless Doorbell_x000D_ Material: ABS_x000D_ Uses: Can be used in homes, villas, hotels, factories, the elderly, the sick, pregnant women_x000D_ Specification: 2 for 1_x000D_ Transmitter: _x000D_ Power Supply: Self generating_x000D_ Receiver: _x000D_ Power Supply: AC100-230V_x000D_ Power Consumption: 0.25W_x000D_ Ringtones: 38_x000D_ Transmission Distance: Open Ground > 150m/492ft_x000D_ RF Frequency: 433MHz_x000D_ Ringtone Volume: 50dB/(1m/39.37in) PackageList: 2 xDoorbell 1 x Receiver 1 xSticker 1 x Manual Note: Please follow the use voltage for power supply, the use of other voltages can easily cause fire and product damage!