Product Description: 1) Compact size, can be rolled up and stored easily 2) Portable, easy to bring and play cheerfully everywhere 3) With 4 sets of octachord (49 keys), suitable for all kinds of music play 4) Equipped with 100 tones (00-99 tone control, uses function keys) 5) Power saving design: 4 x No.3 batteries can play for 5 hours 6) 10 demonstration songs 7) Keyboard: 4 sets of octachord + 1 key (total 49 keys)