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PIR Human body induction lamp Stair lamps Walkway light

PIR Human body induction lamp Stair lamps Walkway light

PIR Human body induction lamp Stair lamps Walkway light

One, the working principle of the product Human body has a constant body temperature, general to 37 ° so will issue a particular wavelength of about 10 um infrared, passive infrared sensor is by ...

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