Casio 61 key portable keyboard. No matter who (or where) you are Casio? s CTK-2550 portable keyboard opens up a whole world of music with 61 full-size keys 400 high-quality Tones and 150 built-in Rhythms including the all-new Dance Music Mode. Whether you? re just starting out or using batteries to write your next hit on a tour bus the CTK-2550 delivers hundreds of Tones and Rhythms to jump-start your creativity. It's a perfect introduction to music-making and a great-sounding way to have fun. Product Width 37.2 Inches. Product Height 3.6 Inches. Product Weight 7.3 Pounds. Product Length 12.1 Inches.