Feature: 1. Self Powered Type: Self generated wireless doorbell, no wiring, no battery, one to one signal pairing, no need to worry about connecting with the doorbell next door. 2. Caregiver Pager: Not only a doorbell, but also a wireless caregiver pager, suitable for babies sleeping alone, the elderly, pregnant women, and guarding your family. 3. Waterproof Doorbell: The doorbell transmitter is IP68 waterproof, not afraid of the sun, can be used safely in rainy and foggy days, and can prolong the service life. 4. Long Distance Transmission: Doorbell supports 150m/164yd long distance signal transmission in barrier free areas, and can wirelessly through walls with strong penetrating power. 5. Loud Sound: The volume is loud to solve the problem that the elderly cannot hear. You can also set one key mute and do not disturb, which is convenient for the elderly to use. Specification: Item Type: Wireless Doorbell Set Material: ABS Usage: Can be used in homes, villas, hotels, factories, suitable for the elderly, patients, pregnant women with one key call Doorbell Transmitter: Power Source: Self Generated Doorbell Receiver: Power Supply: AC100V-230V Power Consumption: 0.25W Ringtones: 38 Ringtones Transmission Distance: Open Space > 150m/164yd RF Frequency: 433MHz Ringtone Volume: ≥50dB/1m. Package List: 1 x Doorbell Receiver1 x Doorbell Transmitter1 x Sticker1 x Manual Note: 1. Do not place the product in an environment that is too humid and high temperature!2. Please supply power according to the voltage used. Using other voltages may cause fire and product damage!