Intelligent Power-Off Protection: Rechargeable USB charging metal engraver pen, there is a built-in overload protection chip, when the resistance is too high, it will automatically power off to protect it, and prolong the service life of the jewelry engraving machineHigh Speed: The speed of this engraver tool for metal is about 5000-25000r/min, and different speeds are used to engrave different materials. The engraving pen is lightweight and ergonomically designed to give you precise control and engravingLow Noise: The sound of this cordless rotary tool is very low when working, even if someone is sleeping, he or she will not feel very noisy. Great for beginners and professionals to use anytime, anywhere to make unique creations that you likeWide Range of Applications: This etching tool supports you to beautify and engrave in any material supplier, such as glass, wood, eggs, plastic, jewelry, ceramics, leather, rings, etc. You can use this tool for engraving, grinding, polishing, drilling, and cuttingIn order to give you a better experienceafter receiving the product, please fully charge it and then use it