New electronic double lead foot pedal / speed controller for use with vintage Singer machines that have a three pin plug similar to the example shown in the last photo. This includes the model 15, 66, 99, 127, 128, 201, 221 / 222K Featherweight* and the 301. This electronic pedal is easier on the feet than the older button style and does not contain fragile carbon disks that have a tendency to heat up or break if dropped. 110V.  *Only compatible with 222K Featherweights with round pins.