60-Watt Equivalent A21 battery back up light bulb , emergency battery replacement bulb.

What Are Battery Back Up A21 Bulb Used for?

The A21 led bulb with battery backup  can help you get your house ready for any emergency. Reliable, rechargeable emergency lighting illuminates even in the event of a power outage, calming tense situations. To receive up to 5 hours of dependable emergency illumination during a blackout or power surge, simply push the On/Off switch on the bulb. This light can be ready whenever a need arises and fits in a normal light bulb socket.

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