You can play on your own or enjoy the CT-S200 s library of 60 built-in songs. Connect to the free Chordana Play iOS/Android app and take your music further learning how to play your favorite songs from downloaded MIDI files. The class-compliant USB port connects to any Mac/PC/iOS/Android device with no drivers needed. The ultra-compact CT-S200 lets you make music wherever and whenever you want. Just pop in six AA batteries grab the built-in carrying handle and take your inspiration to go.