Control principle:The microwave sensor uses the principle to transmit and receive high-frequency microwave signals (accurately sense the movement and changes of objects), and control the on (on) and off (off) of the load lamps through signal amplification and intelligent identification of the microcontroller program. principle is the principle of radar, which is widely used in aviation, aerospace and industries. Intelligent induction:(1)When someone enters the induction detection range (within a diameter of 16m), the load lamp will light up; when the person leaves through the induction detection range and the set delay time countdown ends, the load lamp will automatically turn off. (2)When a person enters the induction detection range and the load lamp has been lit, if the person has been staying in the induction detection range, as long as the person has a slight movement (including limb movement) before the set delay time countdown expires, The sensor will drive the load lamp to light up continuously until the person leaves and the set time countdown ends, the load lamp will automatically turn off. Intelligent recognition: (1)To put it simply, this product can be set to be off during the day, and only illuminated at night when there are people; it can also be set to be lit at any time as required. (2)This product has a of lighting setting options, customers can adjust according to their needs to adapt to the lighting needs of different ambient lighting conditions. Anti-interference: As we all know, there are many signals of different frequencies in space (such as 3GHz signal of mobile phone, 2.4GHz signal of wifi, 433KHz signal of TV remote control, sound wave signal, etc.), and some signals are similar and similar to human body induction signals. Our products can intelligently identify useful an body induction signals, prevent false triggering of lights by other interfering signals, and product reliability. Colour:White Material:ABS Size:83 x 41mm Package Contents: 1 x Microwave induction switch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.