1、This is a pair of infrared detectors including the transmitter and receiver to enable automatic sensing of ambient changes and when the beam being bothered, it alarms you<br> 2、It is an intelligent item and its alarm distance up to 100m in outdoor environment<br> 3、The transmit power will be adjusted automatically according to the environmental conditions, which greatly extends the life of the launching tube, while lowering power consumption<br> 4、Optical lens up and down while structural adjustments, to adjust faster and more accurately<br> 5、Professional chips and strong anti-interference provide smart detection alarm technology to modern life.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia