Ultimate Arms Gear OD Olive Drab Green Ultra Bright 3 LED Handcrank Cranking Lamp Flashlight with Head Strap Adjustable - No Batteries Needed ! Always Ready, No Battery Needed Handcrank Head Lamp or flashlight Just give this Lamp's dynamo hand crank a whirl. LED lifetime: 10000 hours. Lighting Time after 1 Minute Cranking (3LEDs): 40 minutes. Measures 3 x 2", weighs 4 ozs. Color: OD Green.