20W 3V-15V High Power Hand Crank Generator Portable Emergency Usb Charger CONVENIENT HAND-CRANKED POWER GENERATION: Manual hand-cranked power generation at any time and anywhere, effortless power generation, continuous power supply, can act as rechargeable emergency power supply. LIGHTWEIGHT PORTABLE SIZE: Lightweight and compact size, easy to carry, metal case and beautiful appearance. STRONG POWER GENERATION: High power USB charging generator, super core generator, durable and powerful. HIGH SPEED GREAT POWER: The faster the hand crank speed, the greater the power. The maximum power is about 20W. Solid structure, low noise, stable working performance. OUTDOOR APPLICATION: The generator can be actively applied in fields, field operations, field trips, rescue operations, natural disasters, survival training, emergency communications, long-term power shortage, tourism, emergency power, etc.