Features: This engraving tool made of durable and lightweight aluminum; the ergonomic design of the pen body provides you with precise fingertip control. Easy to use and can let you customize everyday objects to create personalized accessories and gifts by anyone from beginners to professional technicians. The engraving pen has a 4.2V battery. It can be charged by connecting to usb interface which is faster and easy to use. There are 3 gears with speeds for your choices; This engraving machine supports you to engrave, sand, polish, grind, drill and more on your metal, glass, ceramic, wood, jewelry, stone, for your ease and enjoyment handmade fun. Great for marking jewelry or other small items like rings, pendants, etc. Specifications: Material:Aluminum Includes 7bits:1x8mm Polish Bit,1x8mm Fine Polish Bit,1x0.6A Carving Bit,1x0.8A Carving Bit,1x2.5A Carving Bit,1x4.0K Cutting Bit,1x2.0D Punching Bit; Work Rate:10W Transfer Speed:5000-10000-18000r min.(3Gears) Rate voltage:4.2v Diameter of bits:2.35mm Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xElectric Engraving Pen 1xWrench 7xBits 1xCharging Cable