Feature: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 DoorbellMaterial: ABSUses: Can be used in homes, villas, hotels, factories, the elderly, the sick, pregnant womenSpecification: 2 for 1Transmitter: Power Supply: Self generatingReceiver: Power Supply: AC100-230VPower Consumption: 0.25WRingtones: 38Transmission Distance: Open Ground andgt 150m or 492ftRF Frequency: 433MHzRingtone Volume: 50dB or (1m or 39.37in).Package List:2 x Doorbell1 x Receiver1 x Sticker1 x ManualNote:Please follow the use voltage for power supply, the use of other voltages can easily cause fire and product damage!