Infrared sensor switch working voltage: 100-240V; Best sensing distance: 3-5M; Mounting hole diameter: 25mm/0.98inch There are 4 wires, is live wire (L); the outermost blue line is neutral wire (N); Yellow line and inner blue line connect to incandescent lamp or energy saving lamp. PIR motion sensor switch has the characteristic of small size and light weight, easy to install and use in room or cabinet, plug and play. Motion sensors turn on the lights in the dark when people enter the induction area and turn off after 45S if no movement is detected. It only works at night or in darkness. It is suggested that the sensor installation height is about 3.5m; Best sensing distance is 2-6M; The induction angle is forward 110 Suitable for automatic lighting of corridors, stairs, bathrooms, basements, warehouses, garages, closets, advertising lighting. In addition to controlling LED lights, it can also be used to control exhaust fans, doorbells or other devices. Color: White Material: plastic Package Contents: 2 * Control Switch Only the above package contents, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.