Datopal 61 Key Roll Up Soft Keyboard Piano MIDI*Product specifications: ** Keyboard mod: 1) 61 key (standard piano key 5 Octave +1 key) 2) 49 key (standard piano key 4 Octave +1 key) A. Tone: 128 B. Rhythm: 100 C. Demonstration songs: 40 D. Rated voltage: DC 6V(Battery AA 1.5V X 4PCS) (Don't with the battery) E. Output: 500MW F. Size of 49key: main body: 9.6(l) x 22.8(w) x 3.3(D) CM; keyboard:72(L)x17.8(w) x 0.5(d)cm Size of 61key: main body: 9.6(l) x 22.8(w) x 3.3(D) CM; keyboard:88(L)x17.4(w) x 0.5(d)cm * Product features: 1) The "soft keyboard piano" is small and can be hand-carried, it can also be rolled up for easy storage in you hand bag or carrying case. 2) You can sect the "soft keyboard piano" 61 key (5 Octave +1key) for more advanced students 3) The "soft keyboard piano" has many functions which you can sect on the control box: a. 128 tone functions (see tone list attachment) b. 100 rhythm options (see rhythm list attachment) c. 40 Demo songs (see demo song list attachment) d. music recording: MAX X 336 Notes 4) The "soft keyboard piano" uses 4 pieces of a 1.5V batteries which can last for up to 12-15 hours of playing time, you can also plug the piano into a proper ectrical outlet with an adaptor