hand crank is an interesting product recently launched for mobile terminals, being able to produce electricity by simply turning a crank. Products of this kind are not really new, the first models started to appear 2 years ago on the market, but they are important, especially for those who live in areas where the electricity is not stable, or for those who travel often in areas where they do not have access to electricity to charge mobile terminals.
This is the charger that converts one minute of hand cranking into 30-second bursts of emergency power for a connected cell phone. 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. Its integrated 2,000 mAH lithium-ion battery recharges fully from a 2 1/2-hour USB connection to a computer or a USB AC adapter using the included cable, providing ample energy to fully charge most smartphones (requires smartphone charging cable).
Just like other similar products, the Hand Crank has an internal 2000 mAh battery, but to produce electricity that allows you to make a 30-second phone call, you will have to turn the crank quite well. Hand Crank can be purchased available here at the price of $60.
