Features 1,The LED light equiped with sensor,it is a kind of pyroelectric infrared sensors that detect variations in infrared rays.However,detection may not be successful in the following cases: lack of movement or no temperature change in the heat source.they could also detect the presence of heat sources other than a buman body.Efficiency and reliability of the system may vary depending on the actural operating conditions 2,Detecting heat sources other than the human body,such as: ①Small animals entering the detecting area. ②When a heat source,compatible with example sun light,incandescent lamp,car healights etc., or strong light beam hit the sensor regardless whether the detection area is inside or outside ③Sudden temperature change inside or around the detection area causedby hot or cold wind from Heating,Ventilation and Air Condioning,or vapor from a humidifier,ect. 3,Difficulty in sensing the heat source: ①Glass,acrylic or similar materials standing between the target and the sensor may not allow a correct transmission of infrared rays. ②Non-movemnet or quick movements of the heat source inside the detection area. 4,Expansion of the detection area In case of a considerable difference in the ambient temperature and the human body temperature,the detection area many be larger than the configured detection area. 5,Dedection distance: The motion sensor could detect variations in infrared rays however such variations are decided by following three factors.the temperature difference between the target and the surroundings:The large the temperature difference,the