The Eclipse PT-5208U Li-ion Cordless Grinding Tool is for versatile applications including engraving and carving, grinding and polishing, sanding, and cutting. It features 5 speed settings from 5000 to 28000rpm with two buttons to increase or decrease speed. The spindle lock enables quick and easy bit changes. The high performance RS390 motor is powered by an 8V lithium battery pack. The battery indicator has three colors (red, orange, and green) to indicate battery level.