The Foredom  EM is a solid state control in a plastic housing that can be positioned anywhere on a work surface. The hand dial is used to adjust and set speed. This manual style control allows you to maintain and return to a desired speed, time and again, by using the motor on/off switch rather than the speed control to [power up the unit. The EM also has a replaceable fuse that protects the electronics during power surges and work overloads.  5" long, 5 3/4" wide, 2 5/8" high, wt. 2lbs. 

* 2 year limited warranty.  See owners manual for complete detail.