2 in 1 Waterproof Long Distance Remote Control Wireless Doorbell(Silver)

1. Transmitter power consumption: about 10mw 2. Wireless distance: about 300 meters in open space, about 20-50 meters indoors with obstacles 3. Working temperature: -20 to 60 degrees Celsius 4. Transmitting frequency: 433.92MHz 5. Volume range: 25-85dB 6. Working humidity: less than 80% 7. Receiving frequency: 433.92MHz 8. 7-color lights, 38 ringtones 9. The buttons can be directly pasted, no wiring required, easy to install