The wireless door chime has a built in transmitter which sends a radio signal to door bell radio receiver. The receiver will be activated when detecting the radio signal.
1. Use digital codes to avoid interface. 2. 25 optional musical tones, set sounds at receiver unit. 3. Operating range up to 80m (no obstacle problem). 4. Waterproof pushbutton unit. 5. Flashing to install, no wiring necessary. 6. Low power standby, long battery life. 7. Applicable for: emergency call for sick and aged people.