A sewing machine foot controller is a tool that helps to operate the sewing machine. Buyers usually purchase it together with the motor. It allows the user to use their foot to turn the motor of the sewing machine, rather than using their hands constantly.  Just press and hold to turn on, and lift your foot from the pedal to turn off the tool. This directly reduces wrist and hand fatigue, making it easier for you to sew for longe periods of time. The controller also has anti-slip feet, which prevent it from moving around when in use.