Casio CT-S200 Casiotone 61-Key Portable Keyboard – BlackSlim & Stylish Portable Design With the CT S200 you can enjoy music whenever and wherever you like. Its compact size of 930 mm x 256 mm x 73 mm is 30% smaller in volume than the CTK 2500 and CTK 2550 models, and it boasts roughly 16 hours of alkaline battery life*. With a grip at the top of the keyboard and a weight of only 3. 3 kg, it couldnt be easier to carry. The design incorporates rounded edges and corners, making it safely portable.. Interface