Feature:1. Mini And Portable: This electric grinder pen is mini and portable, light and compact, will not feel fatigue even for long time use2. Universal USB Interface: Engraver pen adopt universal USB interface, no need for power adapter, get rid of restrictions3. 0.5‑3.2mm Clamping Range: Brass thick wall chuck, possess excellent corrosion resistance, clamping range from 0.5‑3.2mm4. 46 Accessories: Suitable for household, egg carvings, finely carved, and jewelry, with a set of 46 accessories to meet different using needs5. 5000, 10000, And 15000rpm Variable: The no load speed is adjustable in three levels of 5000, 10000, and 15000rpm, very flexibleSpecification:Item Type: Rotary Tools KitMaterial: ABS + brassPower Supply Type: Rechargeable, lithium battery technologyAccessories: 46 PcsCharging Mode: USBRated Voltage Range: 3.6VBuilt in Lithium Battery: 3.6V 700mAhChuck Size: Approx. 3.2mm / 0.13inNo Load Speed Three Levels: 5000-10000-15000(rpm)Applicable Objects: Household, egg carvings, finely carved, and jewelry.Package List:1 x Electric Sharpener1 x USB1 x User Manual46 x Accessories