按下键可模拟高度仿真的报警声音，并看到8只LED中相邻的3只旋转滚动显示，再次按下按键时可停止报警声音并关闭所有LED。-Press the key to simulate a high degree of simulation of the alarm sound, and saw eight LED in the adjacent three rotating scroll, press the button again to stop when the alarm sounds and c