Versatile Electric Grinding PenThe Mijia Electric Grinding Pen offers high-speed, precise control ideal for engraving, polishing, carving, sanding, and more. 16 Multifunctional Grinding HeadsEquipped with 16 different grinding heads, this set covers a wide range of applications - from fine engraving to rough sanding. Durable Brushless MotorEquipped with a long-lasting brushless motor for consistent and reliable performance. High-Speed SharpeningEfficient sharpening with a rotation speed of 15,000-22,000 RPM for quick and precise results. Durable Storage CaseComes with a compact storage box that keeps your accessories neatly organized and easy to carry. Ideal for on-the-go DIY projects or safe storage at home or in the workshop. Specifications: Product size: about 184x20x20.6mm Product net weight: about 310g No-load speed: 15000-22000 rpm Battery type: lithium-ion battery Rated capacity: 800mAh Plug-in use: 5V-3A Charging parameters: 5V-1A Charging interface: Type-C Charging time: about 90 minutes Working temperature: 0~40 Storage temperature: -10~45 Package included: 1 x Electric Grinding Pen 16 x Grinding Heads 1 x Storage Box 1 x Charging Cable 1 x Chinese Instruction Manual