<b>Usage</b><br> <b>How does it work? </b><br> 1.The rechargeable light bulb works as ordinary led light bulbs during daily use; <br> 2.The light bulb lights up automatically when the main power source in your home is cut off. <br> <b>How does it recharge? </b> <br> It recharges automatically during daily use.You turn on the light and the battery light bulb get charging.<br> <b>How long does it work with battery? </b> <br> The emergency light works for 4-5 hours with backup battery.<br><br> <b>3 Way To Light Up with Battery </b> <br> 1. Light up by fingers -- Test whether the A19 bulb is fully charged or used as flashlight for lighting.<br> 2. Screw on the power cap -- convenient for you to use for camping light and outdoor lighting.<br> 3. Screw it to socket -- cut off the power and screw it on. Please note that it won't light up if you leave the power on and just turn off the switch.<br><br> <b>Specification</b> <br> Color temperature: 5000K <br> Lumen: 750-800lm <br> CRI: >80 <br> Voltage: 85-265V <br> Power output: 12W <br> Applicable lamp base: E27(Also applies to E26)