Features: 1. Self-Powered: A self-powered wireless doorbell that requires neither wires nor batteries. One-to-one signal pairing eliminates concerns about connection problems with nearby doorbells. 2. Caregiver Alarm: Not just a doorbell, but also a wireless caregiver alarm, suitable for infants sleeping alone, the elderly, pregnant women, and those caring for family members. 3. Waterproof Doorbell: The doorbell transmitter has an IP44 waterproof rating, is impervious to wind and rain, and can be used safely in rainy or foggy weather, extending its lifespan. 4. Long-Distance Transmission: The doorbell supports long-distance signal transmission of 150 meters/164 yards in open areas and has strong wireless wall-penetrating capability. 5. High Volume: High volume solves the problem of elderly people not being able to hear. You can also mute the sound with one button to avoid disturbing others, which is very convenient for the elderly. Specifications: Product Type: Wireless Doorbell Set Material: ABS Uses: Suitable for homes, villas, hotels, factories, etc. One-button mute, suitable for the elderly, patients, pregnant women, etc. Doorbell Transmitter: Power Supply: Self-generated Doorbell Receiver: Power Supply: AC100V-230V Power Consumption: 0.25W Ringtones: 38 Ringtones Transmission Distance: 150 meters/164 yards in open areas and higher RF Frequency: 433MHz Ring Volume: 50dB/1 meter