Features 1、USB CHARGING: This electric polishing pen is rechargeable, equipped with a USB cable and built in 300mAh lithium battery, making it easy to use anytime, anywhere. 2、SAFE OPERATION: Built in safety circuit board and smart overload protection chip, it will automatically cut off the power supply when the working resistance is too high. 3、HIGH CONCENTRICITY: The integrated design of precise bearings and extended rotating shafts effectively improves the concentricity of electric grinding pen rotation. 4、SPEED REGULATION: The grinder pen has a working power of up to 10W, 3 levels rotational speed, adjustable range of 5000-1800rpm, suitable for different materials. 5、STABLE CLAMPING: The replaceable core copper chuck is firmly clamped, stable and not skewed, making it easy to achieve precise punching and engraving. 6、ACCURATE CONTROL: Lightweight aluminum alloy frame and ergonomic grip provide precise fingertip control, with low working noise, suitable for use in quiet scenes. Specification Item Type: Electric Grinder Pen Material: Aluminum Alloy Battery: 1 x 300mAh 4.2V Lithium Battery (built in battery) Speed: 5000rpm (low speed), 10000rpm (medium speed), 18000rpm (high speed) Power: 10W Package List 1 x Polishing Pen 1 x USB Cable 2 x Wool Wheels 1 x Connecting Rod 2 x Drill Bits 3 x Cutting Blades 5 x Grinding Heads