... 100,000hours3)Built-in rechargeable battery4)Recharge by rotate the crank handle or DC 6V apapter (not include),anywhere and anytime ... high)6)Conventient fold out hanger in handle7)Rotate the crank handle at an average speed of 120RPM ,one minute of ... cranking should yeild approximately 20 minutes of power(4LEDs)Cmping lantern ,ideal for emerency, camping&hiking, power outages,earthquakes,boating, ...