Perfect for the aspiring musician. The CTK 3500 comes with 61 standard keys. Ideal for learning at school or in the comfort of your own home. The CTK 3500 is most certainly ideal for anyone in the early stages of learning. Easy to use for beginners and advancing learners. The CTK 3500 allows you to explore a range of presets and sounds. With 400 voices, over 100 rhythms and songs, that lend themselves to instructive music lessons. The CTK 3500 makes learning as simple as ABC. Compatible with Android and iOS devices, Chordana Play connects to the CTK 3500 and teaches you to play in a fun, visual way. Follow the music score or piano roll notation at your own pace, with the app guiding you through each step.