Feature:1. SAFE TO USE: The sanding tool is rechargeable and come with a USB cable. Built in protection circuit board and intelligent overload protection chip. When the working resistance is too large, will automatically cut off the power supply to prevent damage2. LOW NOISE OPERATION: This electric sander operates with very low noise. Don't worry about affecting the rest of your family3. LIGHTWEIGHT AND PORTABLE: The body of the sanding tool is lightweight and compact. You can take with you. Super easy to use, perfect for beginners or professionals4. VARIOUS FUNCTIONS: Equipped with 9 different types of grinding heads, as well as the three level speed adjustment of the electric grinding pen, which can meet your various grinding needs, and the battery life can be up to more than 1 hour. If you need to use for a long time, you can connect the power cord5. WIDE APPLICATION: Suitable for grinding various chip ICs, cutting motherboards, brackets, removing screws, etc.Specification:Item Type: Electric Engraving PenMaterial: Alloy steelClamping Diameter: Approx. 2.35mm / 0.09inSpeed Level: 3Battery: 1 x 3.6V Lithium battery, Battery Capacity: 280mAhApplication: Suitable for grinding various chip ICs, cutting motherboards, brackets, removing screws, etc. Package List:1 x Host1 x Data Cable9 x Grinding Head1 x Hex Wrench1 x Grub ScrewNote:Can be used while charging.