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 inside blue line connect to light bulb or energy-saving lamp. PIR motion sensor switch has feature of small size and , easy to install and operate in room or cabinet, plug and play. Motion sensors turns lights ON in the dark when human enter into the induction range and Off after 45S if the motion is undetected .It only work in night or dark .It is suggested that sensor installation height is about 3.5m;Best sensing distance is 2- 6M;Induction angle is front 110° Widely Suitable for auto lighting corridors, stairs , bathrooms, basements, warehouses, garages,closet, advertisement light.In addition to control of LED lights, it can also be used to control exhaust fans, doorbells or other devices. Colour:White Material:plastic Package Contents: 4 x control switch Only the above package content, other products are not included. Note: Light reflection 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.