1、SAFE TO USE: The sanding tool is rechargeable and come with a USB cable. Built in safety protection circuit board and intelligent overload protection chip. When the working resistance is too large, will automatically cut off the power supply to prevent damage 2、LOW NOISE OPERATION: This electric sander operates with very low noise. Don't worry about affecting the rest of your family 3、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 professionals 4、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 cord 5、WIDE APPLICATION: Suitable for grinding various chip ICs, cutting motherboards, brackets, removing screws, etc. Item Type: Electric Engraving Pen Material: Alloy steel Clamping Diameter: Approx. 2.35mm / 0.09in Speed Level: 3 Battery: 1 x 3.6V Lithium battery, Battery Capacity: 280mAh Application: Suitable for grinding various chip ICs, cutting motherboards, brackets, removing screws, etc. 1 x Host 1 x Data Cable 9 x Grinding Head 1 x Hex Wrench 1 x Grub Screw