THIS LISTING IS FOR ONE SLIDER CAP ONLY. NOT THE ENTIRE UNIT. Tested, all keys work. Speaker is weak, example in video.

The Casio Casiotone MT-31 is a vintage polyphonic keyboard manufactured in Japan in 1983. This electronic keyboard is part of the Casiotone series by Casio and is known for its compact size and portable design. With its polyphonic capabilities, the MT-31 allows for multiple keys to be played simultaneously, making it suitable for creating layered sounds and melodies. The Casiotone MT-31 is a classic piece of musical equipment that offers a range of tones and features popular among vintage keyboard enthusiasts.