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 caring for your family. 3. Waterproof doorbell: The doorbell transmitter is IP44 waterproof, not afraid of , can be safely used in rainy and foggy days, and can extend the service life. 4. Long Distance Transmission: The doorbell supports 150m/164yd long distance signal transmission in unobstructed areas and can pass through walls wirelessly with strong penetrating power. 5. Loud Sound: The volume is loud to solve the problem that the elderly cannot hear. You can also mute one key and do not disturb, which is convenient for the elderly. 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 rings Transmission distance: Open space > 150m/164yd RF Frequency: 433MHz Ring Volume: 50dB/1m