Features 1. Intelligent power-off protection: Rechargeable USB Type-C metal engraving pen with built-in overload protection chip. Automatically cuts off power when resistance is too high, protecting the device and extending the service life of the engraving machine. 2. 3-level visible speed adjustment: Electric carving pen suitable for various materials, with 5000 rpm in 1st gear, 10000 rpm in 2nd gear, and 18000 rpm in 3rd gear. Use different speeds for different materials. Lightweight and ergonomically designed for precise control and comfortable handling. 3. Low noise operation: The cordless rotary tool operates quietly, making it suitable for use at any time without causing disturbance. Ideal for both beginners and professionals. 4. Engraving machine kit includes 108 grinding bits, 30 grinding needles, and 1 USB charging cable. All accessories are drill bits designed for carving, engraving, polishing, etching, milling, grinding, drilling, and cutting. 5. Built-in 300mAh lithium battery with up to 800 charging cycles. Specification Material: Metal Color: Silver Size: 21 x 14 x 4 cm Weight: 230 g Package Includes: 1 x Engraving Pen 30 x Grinding Needles