Long-distance Wireless Doorbell Solar Doorbell Smart Music DoorbellSpecification: Transmitter working voltage: 3. 7V; Low power consumption of transmitter: 10mw Receiver working voltage: AC90 260V 50Hz; Tone adjustable range: 25 100dB Working Frequency: 433MH; Transmitter Battery: 150mAh (polymer lithium battery) Installation Method: 1. Take out the indoor unit from the package, and connect the indoor unit to a voltage between 90 260V; just press the ringtone switch button and the volume adjustment. 2. Install the
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Long-distance Wireless Doorbell Solar Doorbell Smart Music Doorbell