Features: 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 process 2.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 engraving 3.Portable and Compact: These portable and compact etchers are easy to carry around, allowing you to enjoy a relaxing hand jewelry making time 4.Used to: Can work on metal, glass, ceramic, leather, stone or statues. Can also be used for mobile phone computer motherboard maintenance 5.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 kitspecification:Item Type: Electric Punching Engraving Pen Material: Aluminum Alloy , Electronic Components Battery Capacity: Lithium Battery 300mAh (Shipped with Built in Battery) Collet Depth: Approx. 25mm / 1in Applicable Grinding Head Handle Size: Approx. 3mm / 0.11in Power: 10W Charging: 30 Minutes to 80%, Full Charge in 60 Minutes Service Time: No Load Operation of 3 Level for More Than 1H (if It Needs to Be Used for a Long Time, It Can Be Used While Flushing) Level: 3 Level Speed: 5000-10000-18000rpmPackageList:1 x Polishing Pen1 x Hex Wrench1 x UserManual1 x Charging Line7 x Grinding HeadNoteDelivered with a built?in battery