Janizz Survival Dynamo Hand Crank Emergency Usb Cell Mobile Charger with Red Led GREAT FOR OUTDOOR{SMALL ENOUGH TO FIT IN YOUR POCKET} JUST CRANK IT TO CHARGE YOUR PHONE(2 MINUTES OF CRANK GIVES 20 MINUTES OF POWER) HAND WINDING WITH USB INTERFACE MAXIMUM VOLTAGE OUTPUT DC 5.5 VOLTS(RED LED INDICATOR) NOT SUITABLE FOR IPHONES