Intelligent Power-Off Protection: This rechargeable metal engraving pen uses a USB Type-C charging interface and has a built-in overload protection chip. It automatically cuts off power when the resistance is too high to protect the device and extend the lifespan of your jewelry engraving machine. Low Noise: This cordless rotary tool operates with extremely low noise, so you 't feel any disturbance even while sleeping. It's perfect for beginners and professionals alike to use anytime, anywhere to create your own pieces. Visually Adjustable Speed: This electric engraving pen is suitable for various materials. Different speeds are available to suit different materials. and portable, its ergonomic design allows for confident and effortless engraving., Manufacturer: Akfldms