This is a universal volume controller for keyboards, model VP26U by QuikLok. It is designed to work with at least 5 different brands of keyboards on the market today. It uses a custom potentiometer and a polarity switch. The stereo 1/4" cable is 3 feet long and the base is heavily shielded metal. Suitable for use with Yamaha, Roland, Korg, Ensoniq, and Kurzweil electronic keyboards. New and in the box, ready to add expression to your playing.