[USB Wireless Engraving Machine]: Electric Engraving Pen equipped with a lithium battery, which can be charged through the USB interface. After being fully charged, the wireless use can be idle for up to 30 minutes. Easily help you complete a better engraving process. [3 Levels of Adjustment]: The metal engraving pen is equipped with an excellent motor, and the power can reach 25W when working. 3-speed adjustable speed 5000-25000 rpm. The lowest speed allows you to polish your nails safely, and the highest speed can also be used for metal engraving. [Carving Art, Portable]: These portable and small engraving pens can be easily carried with you, allowing you to enjoy the easy time of making diamond jewelry by hand. [Best Choice for Beginners]: Our metal carving tools are easy to use, especially suitable for beginners. Make keychains, DIY necklaces or send gifts with our kits. [Wide Application Scenarios]: Electric engraving pen can work on metal, glass, ceramic, leather, wood, jewelry,