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 self adhesive sandpaper. The sizes and shapes are easy to recognize, and the various shapes of sanding heads and various sandpapers meet the needs of DIY craft enthusiasts 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 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 Safe Overload Protection: This mini reciprocating sander adopts intelligent overload chip to protect the motor safety at all times, the tool stops automatically when overloaded, preventing the motor loss and prolonging its service life Functional Indicator Lights: Our mini sander has 10 kinds of functional indicator lights freely assigned to meet your different needs, Manufacturer: Akfldms