Black MAXX Stir Plate Graduated aluminum dial face and 2 speed ranges. Once you know where your stir plate needs to run you can "set and forget". PWM (Pulse Width Modulation) technology is a better solution than a regulator based controller - PWM allows better motor speed control with less wasted energy. Low Profile, Compact Design - Measuring just over 2.5" high and just over 8" width and 7" depth, our low profile case has a wide firm footing. This plus the 4 skid resistant rubber feet makes knocking your stir plate off the counter much less likely than other "cheap stir plates". Tough, High Strength Polystyrene Housing - No cheap Radio Shack project box or disposable food container here. Includes Stir Bar - One 2" long stir bar plus a flat "keeper magnet" you use to hold the stir bar in your flask while pouring out your starter.