Features 1. Intelligent power-off protection: Rechargeable USB type-C rechargeable metal engraving pen with built-in overload protection chip. When the resistance is too high, it will automatically cut off the power for protection, extending the service life of the jewelry engraving machine 2. Level 3 visible speed adjustment: This electric carving pen is suitable for all materials, with 5000 rpm in 1st gear, 10000 rpm in 2nd gear, and 18000 rpm in 3rd gear. It uses different speeds to carve different materials. The carving pen is lightweight and ergonomically designed, providing you with precise control and carving. 3. Low noise: The sound of this cordless rotating tool during operation is very low, even if someone is sleeping, they will not feel very noisy. Very suitable for beginners and professionals to use anytime, anywhere, to create unique works that you like 4. This engraving machine kit includes 108 grinding machines, 30 grinding needles, and 1 USB charging cable, all of which are drill bits capable of carving, engraving, polishing, etching, milling, grinding, drilling, and cutting. 5. Built in lithium battery with 300MAH charging cycle for 800 times. Specification Material: Metal Color: Silver Size: 21 x 14 x 4 cm Weight: 230 g Package Include: 1x Engraving Pen Made 30x Grinding needle