It works on when you holding the switch with your foot, release to turn off. The foot switch allows you going on operate the sewing tool without having to a hand to for your off switch, help you save time. Great replacement for lost foot pedal and old foot pedal. Suitable for common household sewing machines on the market, suitable for 6V small sewing machines, Fit for 202, 505, etc. The foot pedal switch security and more reliable, have long service life. Good gift for sewing lovers or family. Specification: Material: Pp Size Chart: Foot Pedal Size: Upper Maximum Width: 57mm/2.24inch, Lower Maximum Width: 51mm/2.01inch, Length: 86mm/3.39inch Cable Length: 70cm/27.56inch Package Includes: 1 Foot Control Pedal Note: Please allow a little size error due to manual measurement. Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the item's color may be slightly different from the pictures. Please understand.