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Accurate positioning
It is compliant with the Secure Digital Music Initiative (SDMI) portable device requirements
Beautiful appearance
carbon monoxide
4 Channel Relay Wireless Module Sensor Kits Accurate positioning4 Channel Relay Wireless Module This is a 4 channel relay module which can be controlled by a wireless remote through a wireless RF link. The wireless board can operate within a range of 50m when the remote is in line of sight and around 25m when indoors. The RF link on this board works on the 433 MHz frequency. How to link the 4 channel relay with remote? To link the remote and relay, power relay board, hold down the button for about 1 second to
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