This roll-up Piano provides portability like no other Keyboard can. Small enough to fit into a shoulder bag, you can take it anywhere. 49 keys (4 octaves) New improved touch 128 tones Percussion keys 128 accompaniment patterns Fingered/single finger chords 30 demo songs Lesson function MIDI out port Record function Sustain/vibrato effects AC Adaptor / 4xAA batteries Please note: When playing a first inversion C chord anywhere on the keyboard, the C note sounds as a C#