按键1到按键7分别是电子琴的7个音调，并且按下会有对应的led灯亮。按下按键8会实现电子琴与音乐自动播放的转换，内置欢乐颂。(The keys 1 to buttons 7 are the 7 tones of the electronic organ, and press the corresponding LED lights. Press the button 8 will realize the electronic organ and music automatic play conv