Reciprocating Polishing Pen Set: This USB fast charging power sander comes with 8 sizes of high quality nylon sanding heads and 12 types of wear resistant self adhesive sandpaper. The sizes and shapes are easy to recognize, and the various shapes of sanding heads and various precision sandpapers meet the needs of DIY craft enthusiasts 3 Speed Adjustable: The compact sander is and ergonomically designed for small projects and complex jobs. The portable and compact exterior provides precise control and breezy manipulation. Featuring 3 speed adjustable design with 2800/3100/3600 strokes per minute, you can get the quickly and smoothly USB Rapid Charging: The electric sanding pen realizes 20 minutes rapid charging, and the intelligent indicator light provides real time feedback on the battery level. The battery life is about 100 minutes when fully and unloaded Safe Overload Protection: This mini reciprocating sander adopts intelligent overload chip to protect the motor safety at all