Feature: 1. Portable hand-operated and rechargeable emergency power supply; 2. The hand-cranked generator can be actively used in emergency communication, long-term power shortage, tourism, emergency power consumption, etc. The faster the shaking speed, the greater the power, and the crest power is about 20W. Specification: Main body material: stainless steel Product color: blue Product size: about 127x88x86mm Product net weight: about 800g Precautions: The generator output voltage must be greater than the set voltage in order to stabilize the output set voltage. When using the USB port for external electrical appliances, be sure to adjust the voltage to 5V first. Please shake the generator clockwise, do not shake the handle at high speed when connecting electrical appliances less than 3 watts.