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这是足球比赛中裁判使用的口哨,同时在表面上加入了计时的功能,可以方便裁判随时观察时间和控制比赛的进程,其单点计时功能也方便伤停补时时间的安排。
This is the whistle used by the referees in football matches, and at the same time, the timing function is added on the surface to facilitate the referee to watch the time and control the progress of the game at any time. The single-point timing function also facilitates the arrangement of the injury time.