Premium Material: Made of steel and iron, the engraving pen body is durable; With ergonomic design provides comfortable grip and precise fingertip control. Visible Adjustable Speeds: 3 speed mode from 5000 to 25000 r/min to meet various needs. With light can show the current rotating speed, allowing you to easily grasp the rhythm of work. Cordless Power-off Protection: Charging by USB port makes cordless operation easier. Cordless working time is 30m. When encountering greater resistance, the engraving tool will automatically shut down to extend its service life. Just press the on/off button to restart work. A professional electric engraving pen for engraving, carving, grinding, polishing, milling, drilling, cutting, DIY etc. It is a practical tool for DIY lover beginners.