Electric engraving pen features USB-C wireless charging, providing up to 90 minutes of cordless use on a full charge. Built-in LCD battery display lets you track remaining power while engraving. Engraving tool comes with 30 premium engraving bits and 16 stencils for detailed jewelry , wood drilling, glass engraving, and metal customization and DIY. You can adjust the wireless engraver's speed with one-click speed adjustment(8000 to 25000 RPM), different speeds are used to engrave different materials. Portable tool is engineered with ergonomic anti-slip grip for a comfortable holding, the designed give you precise control and engraving. Professional engraver tool kit is built-in overload protection chip to prevent overheating. Cordless pen automatically cut off the power supply when the resistance is too high. It's DIY kits, needs to finish by yourself. Color: As Shown Material: Metal Package Contents: 1 set * Engraving pen (accessories as shown in the picture/pen head style is random, no specified style is accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.