1Builtin permanent magnets, brushless motor will generate greater power when operating at high speeds. 2Low heat, low noise and low vibration, sturdy and durable handle, stable use and not hot. 3Ergonomic design, matte surface, pentype body, not easy to fatigue after longterm use. 4035000 rpm, can be rotated and transferred according to your own wishes, safe and controllable. 5Comes with a wireless charger, you can also use your mobile phone to charge, eliminating problem of entanglement.