FEATURES- -Never have a moment of darkness during an unexpected power outage. -Multifunctional emergency LED bulb automatically switches on when the power goes out. -Exclusively made for emergencies, this innovative bulb looks like any other normal bulb and offers a backup time of up to 3.5 hours. -When there is a power failure, this bulb continues to work by drawing power from its inbuilt battery. -It functions like a regular bulb, just make sure you use the bulb often to recharge.