1. The third-generation product combines external adjustment function and high-speed performance. 2. Portable, USB charging, can work while charging. 3. Long range battery: It can be worn more than 17 times when fully charged and stored. 4. There are a total of 38 external adjustment coarse and fine gears, which can be smoothly adjusted while grinding. 5. Heat resistant ceramic grinding core, with a grinding life of up to 8000 times. 6. Easy to operate, electronic touch screen control, visible battery level.