I'm sure this is an effective sustain medal but it does NOT work with a Casio keyboard. As I read searched online I eventually found others who have said this, but I didn't find anything on Amazon stating not to get this pedal if you have a Casio. The polarity is switched and there's no way to change it. Others on Amazon said to plug it in the keyboard then turn on the keyboard to change polarity, but that didn't work for me. After reading, others obviously had this problem as well. I'm hoping to save people the effort of having to return this like I did.