Fzone Soft Roll Up Piano - 49 keys Full size 49 standard keys 4 octave + 1 key keyboard with standard MIDI ou Features 128 tones, 100 background rhythms and 40 demo songs Built in speaker with volume control, headphone jack, external speaker output Roll it up and put it inside the included pouch for easy storage or travel Can be operated with 4 AA Batteries (12 - 15 hours run time)