Quote:
Originally Posted by AremRed
I have never seen Foster without a lanyard, I would assume it is the stopwatch that R's carry to correct timing errors.
Or that's the whistle he uses to keep track of the possession arrow. 
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It doesn't look too much like a whistle, but it also looks too small for a stopwatch. It's not a possession arrow tool because the NBA doesn't use a possession arrow. Perhaps a small stopwatch? That could come in handy in timing errors.