This is a professional electric grinding pen for engraving, milling, grinding, drawing, trimming, polishing, removing and drilling. Both suitable for amateurs and professionals. It is a great tool for your work. Features: Necessary Engraving & Grinding Tool: Come with accessories, meeting different needs for DIY carving and grinding. Adjustable 3 Levels Speed: To meet different occasions and needs, bring you much convenience. Widely Use: Suitable for agate nuclear carving & wood carving with adjustable speed of 7000-14000rpm. Mini nail power drill machine set. Durable & Easy to Operate: Perfect for both amateurs and professionals. Cordless Design: Comes with 400mAh battery and USB cable, without the trouble of messy power line when working, more convenient. Anti-rolling & Comfortable Design: The handy and fall-arrest grip provides superior comfort to control.Light weight and portable. Wide Applications: Perfect for cutting, sanding, polishing nails, engraving, milling, grinding, trimming, removing, drilling and jade processing, etc. Specifications: Color: Green Material: Plastic + copper Input: AC 230V/50Hz or 120V/60Hz Output: 3.7V Rated Power: 1.2W Collet Diameter: 3.2mm No-load Speed: 7000-14000rpm adjustable Application: Carving, engraving, grinding, sharpening, sanding, polishing, drilling. Battery: 13V/400mAh li-ion battery Grinder Size: 15 * 2.85 * 2.85cm / 5.91 * 1.12 * 1.12in Grinder Weight: 137g / 4.83oz Package Size: 17 * 7 * 6cm / 6.69 * 2.76 * 2.36in Package Weight: 176g / 6.21oz Package List: 1 * Electric grinder 1 * Box of accessories 1 * USB cable 1 * User manual