MLB umpires to announce replay decisons for 1st time
MLB News: Umpires Will Wear Microphones During Reviews
Major league umpires wear wristbands to protest 'escalating verbal attacks' from players
MLB umpires could soon be using mic to explain replays
MLB Umpire Microphones in Action as 2022 Season Nears - Crew Chief Ted Barrett's PA Announcements
MLB news: Umpires will wear mics to explain reviews in 2020
5 Times a Mic'd Umpire Would've Been Helpful - Scout Girl Report
The Evolution of Explanations
Beyond the grunt: Umpires mic up, and baseball changes a bit
MLB umpires to use microphones to announce replay review decisions - Sports Illustrated