Casio CT-S100 portable keyboardIntroducing the Casio CT S100 portable keyboard Casio introduced the worlds first electronic keyboard in 1980, bringing the gift of music to millions of people. Nearly forty years later, the new Casiotone series changes everything once again, building on Casios renowned traditions of innovation, versatility and value for money. 61 keys and highly intuitive operation make the entry level model from the CASIOTONE series the perfect musical instrument.