电子琴，自动播放音乐，可以通过按键，发出1,2,3,4,5,6,7等音，音乐可以选择上一首或下一首等-Keyboard, auto-play music, can be key, given 1,2,3,4,5,6,7 and other audio, music, or you can choose the next one on the first such