Feature: 1. 3 Levels: You can switch and adjust the speed with one key. There are 3 Levels in total. The speed of 1 to 3 Levels is 5000, 10000, 18000 rpm, which can be selected according to your needs. 2. Metal and Plastic: The USB Engraving Pen is made of metal and plastic material, which is light in weight, mini and compact, easy to carry, convenient and fast in application, and stable in performance. 3. Lightweight and Compact: The lightweight and compact design of the Portable engraving pen allows you to perform complex work with ease, easily control engraving, drawing way. 4. Scope of Application: The Engraving pen is used for ultra fine, delicate strokes, ideal for engraving on jewelry or other tiny objects, such as rings, pendants, egg carvings, etc. 5. Wide Application: This jewelry engraving machine supports you to engrave, engrave, sand, polish, etch, grind, grind, drill, cut and more on metal, glass, ceramics, leather, wood, jewelry, stone or statue works. Specification: Item Type: Cordless DIY Electric Engraving Pen Material: Metal, Plastic Suitable for Grinding Head Shank Diameter: Approx. 2.35mm / 0.1in Collet depth: Approx. 25mm / 1.0in Speed: 5000, 10000, 18000 Three Levels Power: 8W Use Time: the Third Gear Runs at No Load for More Than 1 Hour. if You Need to Use It for a Long Time, You Can Use It While Charging. Battery Type: Lithium Battery (Ship with Inbuilt Battery) Battery Model: 501550 Battery Capacity: 300mAh Charging: 80% Full in 30 Minutes, 60 Minutes Full. Package List: 1 x Main Unit1 x Hex Wrench1 x Charging Cable30 x Grinding Pins1 x Grinding Needle Storage Box1 x Scribing Pen16 x Templates1 x User Manual Note: 1. This model of electric grinding power is small, not professional electric grinding, adapt to small accuracy carving and grinding field.2. Please do not place the electric grinding machine in a high temperature above 40℃.3. Electric grinding factory power is generally about 50%, the first use before the need to be fully charged after use.