Features 1、Mini And Portable: This electric grinder pen is mini and portable, light and compact, will not feel fatigue even for long time use 2、Universal USB Interface: Engraver pen adopt universal USB interface, no need for power adapter, get rid of restrictions 3、0.5‑3.2mm Clamping Range: Brass thick wall chuck, possess excellent corrosion resistance, clamping range from 0.5‑3.2mm 4、46 Accessories: Suitable for household, egg carvings, finely carved, and jewelry, with a set of 46 accessories to meet different using needs 5、5000, 10000, And 15000rpm Variable: The no load speed is adjustable in three levels of 5000, 10000, and 15000rpm, very flexible Specification Item Type: Rotary Tools Kit Material: ABS + brass Power Supply Type: Rechargeable, lithium battery technology Accessories: 46 Pcs Charging Mode: USB Rated Voltage Range: 3.6V Built in Lithium Battery: 3.6V 700mAh Chuck Size: Approx. 3.2mm / 0.13in No Load Speed Three Levels: 5000-10000-15000(rpm) Applicable Objects: Household, egg carvings, finely carved, and jewelry Package List 1 x Electric Sharpener 1 x USB 1 x User Manual 46 x Accessories