Electric Engraving Pen: Adopt high quality motor and machine parts, sturdy and durable, superior performance. Electric engraving pen: USB charging that can be charged by computer or charging treasure, get rid of the chains of the power cord. And it can be used while charging, which is very convenient. Electric engraving pen: The clamping is stable and not easy to loosen. And the clamping range is 1.0-3.2mm. Electric engraving pen: low noise, high concentricity, no obvious vibration, comfortable grip. Electric engraving pen: can be used for engraving, punching, grinding, sharpening and polishing. Specification: Condition: 100% Brand New Output power: 3.6V No-load speed: 5000/10000/15000r/min Clamping diameter: approx. 3.2mm/0.1in List of packages: 1 x electric grinder 1x USB cable Note: Please note that the new type and old type of this product will be sent randomly, and make sure you do not mind before ordering.