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Burn Calories While Charging Your Cell Phone
By Monica on Mon Mar 4 2013
Burn Calories While Charging Your Cell Phone
Gear  |  Gadget
Converting one minute of hand cranking into 30-second bursts of emergency power for a cell phone sounds cool. This charger is ideal for placing an essential call or sending a text when a cell phone's battery is nearly depleted, its fluid operation provides the same crank-to-power efficiency as dynamos used in larger emergency radios.