Adjustable SpeedThis electric engraving pen has 3 adjustable speeds (5000RPM, 10000RPM, 18000RPM), suitable for different occasions. Usually low speed for metal/wood and fast for glass/ceramic. When fully charged, wireless use can last up to 60 minutes. The miniature metal engraving pen has built-in safety protection circuit board and intelligent overload protection chip. If it is too large, it will automatically cut off the power to avoid damage to the engraving pen. It is very safe to use. Visual Indicators Equipped with speed indicator, battery indicator and overload indicator, you can know the usage of the wireless engraving pen in real time. You can adjust the working speed you want according to different uses. Heavy Duty UseThis mini engraving pen is small and exquisite, and the whole machine only weighs 40 grams. With a metal surface and pen design, it feels comfortable in the hand. It makes it easier to sand and engrave jade, metal, leather, wood, jewelry, glass, ceramics and stone. 16 templates, 3 saw blades (22mm, 25mm, 32mm) and 1 rod and 1 Type-C charging cable. These accessories are sufficient for engraving, sanding, engraving, milling, grinding, drilling, cutting.