This fixed mount light sensor with photocell is commonly used for exterior lighting purposes such as building perimeters, street lighting, parking lots, outdoor signs, landscape lighting and more Installs on electrical boxes for efficient dusk-to-dawn ON/OFF control; 3/8 in. threaded stem with locking nut and rubber gasket Time delay feature of 30-120 seconds prevents unwanted Off switching due to light from passing vehicles Compatible with LED, incandescent, and high-intensity discharge (HID) lights Outdoor operating temperature range of -40°F to 140°F (or -40°C to 60°C)