Do not buy this for a Casio or any other standard keyboard that wants a closed circuit for sustain. Contrary to the suggestions to hold it down while powering it on, Casio doesn't observe that convention for reversing polarity. To modify this pedal, you will need to physical modify the pedal circuit.

Barebones, but it gets the job done as a sustain footswitch and is inexpensive and sturdy. As stated in an other review you can change the polarity by holding down the switch before you power on.

Press down on the sustain pedal as the keyboard turns on. That should change the polarity of the pedal.

This pedal is working nicely now, but be warned, if your keyboard or whatever you are using doesn't work in a reverse polarity mode, it may work opposite, where it sustains when the pedal is not pressed down, and when it is pressed down, it will stop. Inside the pedal I noticed that the two ends are always touching, and they are separated when the pedal is pressed. I had to switch these ends around so that the ends would touch when the pedal was pressed down. I have a Casio WK-3000 and I'm guessing many other models will have this same problem.

I've used the classic-style Yamaha FC4 type pedal in the past for a Roland I used to have. Those hands-down are the best quality pedals, but I've got a low-cost personal Yamaha PSR-262 keyboard now.

This pedal is perfect for it. I was pleasantly surprised how rugged it was for the price. It has great sound to it, smooth action, and a good rubbery grip.

I may be wrong, but it seems like that last pedal I had only sustained when you pressed it. This one is just the opposite...it sustains as a default (non-latching too) and stops sustaining when you press it. If that's not what you like, then don't get this pedal.

I actually like the sustain sound better, so I'm fine with this design.