The Casio CTK-1500 offers easy to use controls and a range of features for the student musician. This model has 61 keys which makes it ideal for younger musicians who dont require a full scale keyboard. The CTK-1550 is battery powered for easy portability so you can take your learning with you. The integrated lesson functions make learning an interactive process whilst the 120 tones keep your playing inspired. The LCD screen allows you to navigate the CTK-1550s features with ease. This model has a smart black finish and is ideal for young musicians wanting to develop.