Sensky BS033C Motion Sensor Light Switch, Occupancy Sensor SwitchWhite (Neutral Wire Required) PIR motion light sensor:This device can detect motion from a heat-emitting source (such a person) within its field-of-views and automatically turns lights ON and OFF. Two mode adjustable:The occupancy sensor switch can also be ON mode, in which you light turn on always. A sensor automatically shuts the lights off when the room is vacant in Auto mode.Auto mode is great for hallway,stairs,or bathroom. Saving energy & money:Motion sensor switch can identify when daylight is in the room.The switch only turns the lights on when they're needed.Saving your money. Neutral wire required:Three wires (Black, Green, and Red,). Black wire goes to Hot; Green wire goes to Natural; Red wire goes to the hot end of your light (the load). Then the other end of the light and the green wire of the switch go to the Natural. Time Delay:Adjustable Time-Delay for customizing: Min: 10sec3sec ; Max:7min2min (The load will stay on for the time you set, then go out).Adjustable Sensitivity; Light Level Sensing; 180 Field View. The wall switch is suitable for indoor use only,Easy to install. If there are some questions about installation, please check the wiring diagram or contact us.