, Dusk Till Dawn Photocell Sensor Switch -- The photocell sensor switch can turn on or turn off light automatically according to ambient-light, and it will shut down during the day and open during the night automatically. , Easy Operate Light Sensor Value -- 5~100lux adjustable. Clockwise adjust will increase light sensor value; Anticlockwise will reduce light sensor value. , Waterproof-- IP55, more suitable for outdoor. , Widely Used -- Street light, highway, factories, garden, ports, airports, farm, parks, schools, and other places. , Quality Guarantee -- Friendly customer service with 1 Year Warranty.