... It turns off when human leave.3. Application:Infrared human sensor switch can be used at: school, hotel, hospital, ... Pic1;Step 3: Insert the bottom case of sensor switch into ceiling hole, and fix it with wooden ... 2; Step 4: Pass 4 wires of the sensor switch through bottom case and wooden board, and spin ... circuit or leakage of electricity.7.5. The sensor switch can be mounted on side wall. Directly ...