128 tones and 100 rhythms are available for pianos, saxophones, harps, and guitars (available selection) It's not only for professional players, but good for beginners as well Connect it with earphones, and one can play it silently With numerous functions and settings such as recording and demonstrative songs, it serves as a supplementary tool during practice Keyboard: 61 standard keys (5 octachord) Tone: 128 tones are available (001 to 128 tone control) Rhythm: 100 accompaniments available (001 to 100 rhythm accompaniment) 20 demo songs Vibrato function Digital display: the tones and rhythms of the roller piano are displayed Inner connection of amplifier: earphone/amplifier (home theater) can be connected externally Power supply: four pieces x AA batteries or DC 6V adapter9) folding and easy to carry Control box size: 10.2 x 18.4 x 3.3cm Keyboard: 88.5 x 17.5 x 0.4cm MIDI out: 16 output channel (optional)