The Casio SP-20 is a traditional piano-style pedal that plugs into your Casio keyboard or digital piano. It is designed to sustain notes in the same way as the damper pedal on an acoustic piano. Compatible with the following Casio models: AT-3 , AT-5 , CDP-120 , CDP-130BK/SR , CDP-220R , CDP-230RBK/SR , CTK-2200 , CTK-2300 , CTK-2400 , CTK-3200 , CTK-4200 , CTK-4400 , CTK-5200 , CTK-6200 , CTK-6250 , CTK-6300IN , CTK-7200 , CTK-7300IN , CTK-810IN , CTK-850IN , CTK-860IN , LK-160 , LK-170 , LK-240 , LK-247 , LK-260 , LK-280 , PX-150BK/WE , PX-160BK/GD , PX-350MBK , PX-3BK , PX-3SBK , PX-A100RD/BE , WK-220 , WK-225 , WK-240 , WK-6600 , WK-7600