The Dremel 8200 does it all, unplugged. It provides a corded performance in a cordless tool for greater versatility with variable speeds between 5000 - 30,000 RPM and its designed so that the controls do not interfere with grip. The 360 degree grip zone has a soft grip for comfort and control. There is a separate on/off switch that retains the speed setting for ease of use and the high-performance motor allows for maximum performance at all speeds. It also features a quick collet lock for fast accessory changes. The 8200 is powered by Lithium-ion technology offering more power in a smaller size with less weight than conventional Ni-Cd batteries. The 12V battery takes 1 hour to charge and holds a charge 6X longer than standard Ni-Cd when in storage so it's always ready. Lithium-ion batteries can be recharged at any time without reducing charge capacity or run time. The 8200 is compatible with all Dremel rotary tool attachments and can be used to carve, engrave, grind, sharpen, cut, clean, polish, and sand. The 1/28 kit comes with one battery, one charger, storage case, accessory case, product reference sheet, 1/8" collet, and 28 assorted accessories. The Dremel 8200 is backed by a 2 year limited warranty.