MLB umpires to use microphones to announce replay review decisions - Sports Illustrated
Video: Umpire, Terry Collins mic'd up during wild 2016 argument - Sports Illustrated
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MLB Umpires to Use On-Field Microphones to Announce Replay Review Decisions to Fans, News, Scores, Highlights, Stats, and Rumors
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Mic'd Up: Umpires Consult Over Call and Reverse Call
New Wireless Audio Lets MLB Umpires Make All the Calls Very Loud and Clear
Umpires might get microphones to explain video reviews, and nothing can possiblie go wrong
MLB Umpires to Explain Replay Review Decisions Via Microphone for 2020 Season, News, Scores, Highlights, Stats, and Rumors
MLB may give microphones to umpires to explain replays
Umpires to wear NFL style mics to communicate instant replay review: report – New York Daily News