Built-in advanced dusk to dawn sensor, automatically turn light on/off from dusk to dawn; turn your standard light fixture into automatic dusk to dawn light, No manual adjustment; NOTE: Please ensure no obstacles block the sensor and light source, and don't use light sensor socket with opaque or forsted-glass light fixtures. No wiring and programming needed, simply screw light bulb into dusk to dawn light sockets, attach it to light fixtures; ensure the sensor faces a natural light source indoors and under shelter outdoors. Equipped with delay OFF function, prevent bulbs from repeatedly flickering due to sudden light sources; after 60s or longer light source motion - Auto Turn Bulbs Off. Color: White. Material: Thermoplastic.