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 close all the LED.