Police Security Dover LED Rechargeable Focusing Flashlight. The Police Security Dover Rechargeable Flashlight is optimal for automotive technicians and mechanics - any professional demanding long-term flashlight performance. With our Quik Connect USB charging system (cable included), this 1000-lumen flashlight functions with a 18650 rechargeable lithium-ionbattery delivering up to 6 hours runtime. With High, Low, Flash modes and Slide Focus, the Dover Rechargeable Flashlight is immediately adaptable to a variety of situations and will be for a long time to come.