Feature:1.Wide Application: It is widely used in carving porcelain, stone, glass, plastic, wood, bracelet, etc. Also, it can be used in polishing and trimming metal surfaces. 2.3-Speed Adjustment: There is a button to switch rotation speed among 5000-15000r/min, which adapt to different working condition.3.Energy-Saving Design: This electric engraving pen is powered by USB cable, which is eco-friendly, energy-saving and convenient to use.4.Heat Dissipation Design: Double-sided cooling holes help dissipate heat so as to prolong its service life and make work safer. 5.Portable Design: There is an ergonomic handle designed for comfortable gripping. You can use it anywhere anytime.Specification:Item Type: Electric Engraving PenSpeed: 5000-15000R/MINClamping Size: 1.0, 1.5, 2.0, 2.5, 3.0Input Voltage: 5V/2APower Supply: USB Color: Black Package Includes:1 * Electric Engraving Pen1 * USB Charging Cable3 * Grinding Bits6 * Drill Bits1 * Mini Spanner5 * Brass Collets1 * Set of 105Pcs Accessories (Optional)TipsThis is a plug-in power type and needs to be plugged in power all the time.