Dremel 8200-2/28 12-Volt Max Cordless Rotary Tool Variable Speed from 5,000 to 30,000 RPM; Easy to understand speed dial with increments that correspond directly to speed Soft-Grip for comfort and control Works with standard attachments plus "high performance" level attachments, and all accessories Separate on/off switch allows user to "set & forget" speed setting Removable Lithium Ion (12V Max) Battery for continuous use and extended run-time