Alien Energy Invert bulb, Built-in Rechargeable Battery; Battery backup up to 4 hrs; 100-264 VAC provides safety against voltage fluctuations in AC Mode. Bulb Base: B22, Color Temperature: 6500K, Watt: 9WEnergy-efficient: LED bulbs don’t lose nearly as much energy to heat as incandescent bulbs, so you get the same light with less wattage.Safety: LEDs do not contain mercury like other bulbs such as CFLs or fluorescent lamps.Long-lasting: Last up to 50,000 hours while incandescent bulbs burn out after 1,000 to 2,000 hours and CFLs after around 15,000Dimmable: These bulbs can be adjusted with LED-rated dimmers to enhance the lighting in your space.Slow Failure: While many bulbs burn out in a flash, LEDs slowly fade, giving you extra time to find a new bulb.