Jonta uses a state-of-the-art super bright LED technology and is totally independent of replaceable batteries and external power sources nbspFull specificationWind up Mechanism Can be cranked in both directions the harder you crank the more energy created An LED indicates the optimum winding speed the only limitation to how much energy you create is you ACDC A 12 hour charge fully charges the flashlight LightMicroprocessor controlled 1-Watt super bright white LED A choice between energy saving and full power or flashing beam The excellent beam quality from the Jonta maintains focus at over 50 yards LED has a useful life of up to 100 000 hoursBattery level Displays battery charge level A warning light when the battery is very low Power Source Wind up AC alternator driven by the crank Charging Adapter Rechargeable Battery Light Source 1Watt super-bright LED Shine Time nbspFully recharged battery 24 hours Energy Saving Fully recharged battery 25 hours Full Power 30-second wind 109 minutes Energy Saving Adapter Charge Rate 12 hours 100 capacity Dimensions nbspHeight 34 86mm Width 32 80mm Length 85 217mm Weight 157oz 445gnbsp