This bulb is Very special and intelligent LED bulb, there is a lithium battery included, the battery will be charged when you use the bulb daily, so when real power outage, battery will release energy for emergency lighting.
The LED emergency bulb use good quality material including body, base, cover, driver and smd5730 led chip.
When power failure,the bulb will automatic switch to emergency model promptly, continue working with low power.
This Emergency bulb widely use in stair hall, passageway, living room, toilet, etc. with our switch cap ,you can use the bulb anywhere and any time!
Emergency Bulb A21 9W Rechargeable LED Light With Built-In Battery
Luminous efficiency: 95-100lm/w
Emergency time : 3-4 hours (can adjust up to 6 hours)
Voltage range :100-240V AC