Prepare your home for any emergency with the Feit Electric battery-backup Intellibulb. Reliable, rechargeable emergency lighting turns on even if you lose power, making frantic situations less frantic. Simply press the On/Off button on the bulb and get up to 3 hours of reliable emergency lighting during a black out or power surge. This light is rechargeable, fits a standard light bulb socket and can be ready whenever a need occurs.