Designed to be cranked clockwise only. The faster the rocking power, the higher of the generation power and voltage. According to our test, rotate the handle 2-3 Circle per second, then the phone could be charged stable
Portable, Compact Hand Crank Generator Measures: 4.92" X 3.15" X 3.34"(L*W*H). Easy to carry
Solid construction and sturdy metal outer case. 4 anti-slip foot pad makes it more stable when rotating the generator handle
Note: This generator doesn't contain battery, therefore, it doesn't support internal power storage function. Make sure the Voltage for the USB charger needs to be at 5v.
