1. Material: ABS resin
2. Dimensions: receiver 9.5x6.5x3 cm, transmitter 8x4.5x2 cm
3. Weight: about 40 grams
4. Working distance: about 100 meters
5. Waterproof: IP44
6. Power supply mode: transmitter contains 23A 12V battery, receiver 2 x AA batteries (need to purchase by yourself)
7. Applicable scenarios: family residences, office buildings, hospitals, restaurants, etc.
8. Features: good signal, strong penetrating power, no wiring required, easy installation, flashing lights for incoming bell, durable