Release and sustain your creativity. The LD Systems SP1 Sustain Pedal offers greater control of your sound, and control of the sustain on a variety of keyboards and digital pianos. The Sustain Pedal can also be used in a variety of ways, thanks to the polarity switch, which can set the pedal to normally closed or normally open modes. The 1/4'' jack connector is compatible with any standard keyboard or digital piano, and is linked to the pedal via a convenient 2 meter long cable.