This kind of flashlight is a new LED emergency lighting,it can be set in an ordinary lamp holder ,It has two switches,i.e.AC,DC.when the switch is set to AC position,and the power was fulled,It could be used as an energy-saving lamp ,when the electric power was cut, It could be used as emergency lamp.when the switch was set to DC position,it will automatically light in the case of the electric was cut,it will automatically charge in the case of the electric was regained,it was equipped with a high-energy lead-acid batteries Inside of it.