Over seven billion phones exist in the world today, and every one of them needs daily recharging - but often power is nonexistent or only intermittently available. Boost Turbine is a back-up battery with hand crank turbine to charge phones on the spot, without relying on the grid. It’s good for everyday use or in an emergency situation when you need to charge up instantly to make a call or text. The iconic product appearance, with the crank knob end poking through the body, is derived from the crank handle storage position and its fold-out geometry. Quality of details and quality of fit and finish are extraordinary on this design. Made of die-cast aluminum, polycarbonate, and rubber, this unit feels like a little machine.