Dusk to Dawn Sensor for Outdoor Lighting-3 Pieces Photoelectric design: photo eye light sensor is reliable and quality, weatherproof and anti-rust, stable and safe, you can use with confidence; Built-in external photosensitive switch, also applied as a small and rainproof street light controller photoelectric switch Intelligent detection design: this light sensor photocell turns on your exterior lights at dusk and dawn, automatically control lighting according to ambient lighting levels; The internal design has an automatic ambient light level detection circuit that automatically switches off during the day and on at night Waterproof to withstand bad weather: equipped with a waterproof cap, photo eye sensor for outdoor lights is designed to double protect the sensor lens, assists the conversion to work better in harsh environments, like rainy, windy, snow day and so on Multiple compatibility: light switch daylight sensor's voltage is 120-277VAC, can be compatible with most lamps, such as incandescent, fluorescent and LED; Remember that LEDs operate on DC power, other voltages are not suitable Easy to Install: the photo control can work with most fixtures and bulbs for hardwire outdoor lamp posts, which are required a mounting hole less than 0.6 inches in diameter; Disconnect power, remove junction box cover, place the photocell light switch in knockout hole and fasten with lock nut