A20 Pro Plug in Free Waterproof Rechargeable Long-distance Wireless Doorbell

1. Material: ABS
2. Voltage: 110-240V
3. Volume: 8 levels
4. Distance: 180 meters
5. Power: 0.5W
6. Working frequency: 433MHz
7. Support one-to-one signal pairing, long-distance transmission, signal coverage without dead angles
8. 29mm large speaker, easily heard within 300 square meters
9. The buttons can be directly pasted, easy to install, plug and play