Features: 1.USB RECHARGEABLE: The Cordless Rotary Tool is rechargeable, comes with a USB cable, and has a compact, pen like design that is lightweight and easy to carry. 2.SAFE AND RELIABLE: Etching power tool has a built in safety protection circuit board and intelligent overload protection chip, which automatically cuts off the power supply when the working resistance is too large to prevent damage. 3.3 SPEED ADJUSTMENT: Cordless etching engraving tool is suitable for different materials, the speed can be adjusted within 3 speeds from 10000RPM to 20000RPM, high efficiency and low noise. 4.EASY TO OPERATE: Ergonomic grip gives you accurate fingertip control, this tool is easy to operate and suitable for beginners or professionals. 5.WIDELY USED: Electric engraving pen allows you to DIY and can be widely used for engraving, sanding, polishing, etching, wiring, grinding, drilling and so on. specification:Item Type: Electric Engraving Pen Material: Aluminum Alloy Speed: 10000, 15000, 20000 Voltage: 3.7V Power: 10W Battery Capacity: 380mAh (Ship with Inbuilt Battery) Battery Type: Lithium Battery PackageList:1 x ElectricEngravingPen (Ship with Inbuilt Battery) 8 x Sanding Head 1 x Data Cable