Get up to 3 hr of emergency battery back-up lighting if you lose power with the Feit Electric back-up battery LED bulb. Reliable, rechargeable emergency lighting, this bulb turns on even during blackouts. Install battery back-up light bulbs and make frantic situations less frantic. They are ideal for locations that have frequent storms or power surges. No more hunting in the dark for flashlights and candles. A21 shape back-up bulbs fit in a standard E26 light bulb fixture and work just like a regular bulb until the power goes out. When the power cuts out, push the power button to switch to battery power and they will continue to shine. OM60/927CA/BATG2LEDI bulbs use just 8.8 W while providing a similar 800 Lumens light compared to 60 W incandescent bulbs. Save 85% on energy costs with the same soft white 2700 K glow. They charge while being used as a regular bulb, so they will be ready to shine the power goes out. Enhance LED light with 90+ CRI color rendering makes colors appear vibrant and skin tones look more natural, all while saving energy and lasting for a decade or more.