3 gears speed regulation, 1 gear 5000 rpm, 2 gear 10000 rpm, 3 gear 18000 rpm.
Built-in lithium battery 300MAH charging cycle 800 times.
Full electric lettering, portrayal, and other functions.
Its lettering pen is made of stainless steel, hard and hard, like iron, stone, wood, plastic, metal, etc. can be engraved.
Small and exquisite, easy to carry.