Bigtree1981 Ac Dc 12v 10a Auto on Off Photocell Light Switch Photoswitch Light Sensor Switch To turn on or off the light in day and night without manual operation on or off the light in day and night without manual operation Do not install the control unit in a place extremely darker in daytime or a place directly by lighting of turning - ON lamp Widely used: street light, highway, factories, garden, ports, airports, farm, parks, schools, and other places. Also can fit into solar lamps and lanterns, or cars, motorcycles, electric cars and other power supply voltage is 12V lamps and lanterns or equipment