Engraving pen cordless equipped with a 300mAh lithium battery and use up to 3-5 hours after a full charge. The engraving pen has a built-in overload protection chip and automatic power-off protection when the resistance is too high, prolonging the service life of the etcher engraver tool. The speed of the engraver pen for all materials is about 5000-18000r/min, and different rates are used for engraving various applications. This etcher engraver tool is the most suitable for polishing your nails/ carving / sanding / polishing / rust / drilling / cutting tools for novices and professionals. With an aluminium body weighing only 40g and a qualified pure copper motor, this engraving pen can work with low noise. This portable and compact etcher engraver tool is convenient and allows you to enjoy relaxing hand-drill jewelry making time anywhere and anytime aid douiee you want.