Our rechargeable LED light bulb which works as a regular LED bulb(suitable for E26/E27 base) and as emergency light. The built-in battery will be charged in your daily use, once suddenly power outage the battery will release energy and lighten the bulb for emergency, sustainably provides 3-4 hours of illumination. You will never be left in dark any more. In addition, it can be hung up with provided hook and widely used as camping light, flashlight, hook light, warehouse light, etc.<br><br>