Automatic turn On in the night and turn Off in the daytime (keep the power switch on, the bulbs do the rest) Plug and Play, no wiring, timers or additional hardware needed (built-in photocell detector) Super bright & Money saving, 12-watt provide 1000-lumens, replace 100-watt halogen bulb, save you 85% on electricity bills No flicker, No flash, No mercury, 100-240V Ac operating voltage, rated to last 13 years based on 3 hours per day use Tips: 1Not suitable for use with dimmers 2Power switch should always be left on as the bulb will shut off on its own when it senses daylight 3 make sure the bulbs are not pointing directly at each other to avoid interference(bulb distance keep at least 2meter66ft)