Twin Fan High Efficiency Dust Collection ? while one fan cools the motor, the other collects dust resulting in maximum dust pickup efficiency * Automatic Belt Tracking ? tool automatically adjusts belt to center of platen for alignment * Variable Speed Dial with Electronic Feedback ? match the speed to the desired removal rate. Electronic feedback helps maintain motor speed under load for consistent results. * Flush Sanding Capable ? flat face allows for flush sanding against vertical surfaces * Tool-Free Belt Release ? makes changing belts quick and easy