$5.20
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
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