12w Rechargeable Energy Saver Bulb 4pc screw.

As a common bulb, when there is regular electricity supply, it lights up, while charging at the same time. As an emergency bulb, its intelligent emergency and charging circuit turns on automatically, switching to emergency lighting within one second.  You are guaranteed 2.5 hours to 4 hours of high lumen visibility, depending on how long the bulb was charged. This solves the inconvenience caused by power outages.

ED Rechargeable Emergency Light/Energy Saver Bulb can be used in both residential and commercial environments, in places such as the kitchen, corridors, bathrooms, basements, garages, supermarkets, warehouses and other sites where emergency lighting is necessary.