Reciprocating Detail Sander Tool with 8pcs Sanding Head 3 Speed Adjustable Colorful Light Cordless USB Charging Electric Pen Sander with 12 Sheet Self-Adhesive Sandpaper and Storage Box Specification: Color: Red and Black Main Material: ABS + Nylon Reciprocating action: 2.5±0.1mm Horizontal reciprocating tolerance: ±0.1mm Osilating tolerance(left/right): ±0.1mm Battery capacity: 280mAh Output current with load: 750mA max Output current without load: 250mA max Rated power: 2.8W Input voltage: 5V Output voltage: 3.7V Input current: 1A Charging time: 20±min Work duration with load: 100±min Max. pressure: 320g/360g/430g(3 speed) Sanding speed: 2800rpm/3100rpm/3600rpm(3 speed) Pen size: 178*21*18mm/7*0.8*0.7in Pen weight: 55g/1.9oz