Rechargeable LED Bulb, LED Bulb, With Battery Backup, Emergency LED Lamp, Study Lamp, Rechargeable Bulb, 20 Watt AC DC Bulb. Keep your home bright even during a power outage. Housing a built-in battery, these rechargeable light bulbs automatically turn on once you get hit by a blackout. USE LIKE A REGULAR LIGHT BULB - These light bulbs with battery fit in any standard socket. Use it just like a regular light bulb, which you can turn on or off using your light switch. 20 watt emergency LED light bulb Rechargeable LED Bulb 2 Hours Battery Timing 20 watt Rechargeable Batteries.