Feature:1. USB Wireless Engraver: These engraver tools come with lithium batteries that can be recharged via a USB port. When fully charged, wireless use will leave it idle for up to 60 minutes. Easy to help you complete a better carving process2. Good Performance: Metal engraving pen equipped with excellent motor, working power is 10W. 3 speed adjustment 5000‑18000 RPM, suitable for different places. Minimum speed allows you to polish nails safely, maximum speed can also be used for metal engraving3. Portable and Compact: These portable and compact etchers are easy to carry around, allowing you to enjoy a relaxing hand jewelry making time4. Used to: Can work on metal, glass, ceramic, leather, stone or statues. Can also be used for mobile phone computer motherboard maintenance5. Easy to Operate: Our metal engraving tools are easy to use and are especially suitable for beginners. Make key rings, DIY necklaces or give gifts with our kitHow to Use:1. Install the grinding head: put the grinding head into the collet and tighten the fastening screw of the grinding head with the matching Hex wrench2. Startup use: gently press the startup key once to enter the 1 level working state, and the speed is about 5000 rpmPress the start button again to enter the working state of level 2 for about 10000 revolutionsGently press the start button a