2 in 1 AC/DC 12W Lonen Rechargeable LED Bulb: The intelligent LED bulb for both EMERGENCY & REGULAR use works on both standard AC Power and also on in-built Rechargeable battery (DC Power). It is power saver convenient. Equipped with Two DC operation ways: Light up/ light off with finger touch or receptacle mounted. Suitable for home use or outdoor use.Emergency Function:? With Grid Power ON, the LED bulb works as ordinary bulb while the in-built battery is being charged. When power fails, it converts automatically from AC to DC and can light on for 3.5 hours.