2) High-frequency output of this sensor is ≤10mW (test value is less than 0.01mW) that is just one 100th of transmission power of mobile phone or output of microwave oven.
3) Used for situation that it"s hard to mount sensor outside, such as many kinds of ceiling lamps and electric appliances with plastic crusts, can detect slight movements through doors, panes of glass or thin walls, sensor can work.
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