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 looking after your family. 3. Waterproof doorbell: The doorbell transmitter is IP44 waterproof, not afraid of , can be used safely 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 barrier-free 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 set one-key mute 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,