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It's a relatively new audio device for Major League Baseball - the PitchCom, which allows catchers and pitchers to figure out what's coming as they face an opposing batter, a replacement for those old "finger signs" that were around for eons.
So what does it sound like? They gave viewers a sample on a recent New York Mets broadcast. If you're curious, you can have a listen here.
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Thanks for this. Really interesting.
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Can't wait for the Houston Astros to try and find a way to listen in on the opponent's PitchCom.
Now where did I put that garbage can lid?