The SP-3 Sustain Pedal is a compact pedal and it is compatible with portable Casio keyboards and digital pianos that have a 1/4" pedal-input jack. When the pedal is held down, even after the keys are no longer being played it sustains a notes on a piano. It has a 1/4" right-angle jack for convenience. Sustain Pedal for Casio Digital Pianos. Works with many brands of keyboards. • MFSKU SP3 • UPC 079767399511