This motion sensors light bulb socket is suitable for E27 screw on illuminates, it can convert your ordinary light bulb into a sensors light When the human body passes through the sensing ranges of the light bulb, the light bulb automatically lights up and goes out automatically after the person leaves Sensing distance: 3-5m. As long as the human body is within this ranges, the light bulb remain on. When it leaves the sensing ranges, the light bulb automatically extinguishes Adjustable Brightness: “deeply Darker”- The sensors does not work during the day and enters sensing mode at night. “Light Darker”-The sensors is in a sensing condition in a dim environment. “All Day”-The sensors is in a sensing condition 24 hours a day. Timer: 262s, 32s,16s, The induction light will remain on for a corresponding period of time before going out You could use in Basement,Storage Room, closet, stairs, corridors, hospitals, exhibition hall