a. Keyboard: 49 (61)standard keys b. Tone: 100 tones are available (00~99 tone control) c. Rhythm: 100 accompaniments available (00~99 rhythm accompaniment) d. Digital Display: in which the tones and rhythms of the roller Piano are displayed. e. Inner Connection of Amplifier: earphone/amplifier(Home Theater) can be connected externally. f. Power Supply: with power saving design. inbuilt 4 AA batteries (can be played continuously for 5 hours), available for outer connection of power.