I guess mine would be called a speed regulator-- it plugs into my machine instead of the foot pedal. I have it taped to the table at the front of my machine. It has a single stitch, a run, and speed dial. It had to fit the plug- in where the foot control installed. I like it a lot because it holds steady speeds-- whereas my foot was not consistent. I got the " Grace' to fit my Elna (same as Janome).