Always wanted to build your own security system and integrate into your home automation solution. Well now you can with the DW2-RF sensor from Sonoff. The sensor has a built in battery (not included) that can last for more than a year and therefore doesn't require any wires to be drawn to the sensor.
Communicating via RF it doesn't have to be close to your Wireless router for reception and communicate up to 50m. However it does require an RF bridge from Sonoff to work.
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