At last, MLB umpires will communicate with fans about replay
MLB News: Umpires To Wear Microphones During On-Field Reviews
Baseball instant replay: New system, new strategies – The Mercury News
MLB Umpires To Begin Announcing Replay Decisions - MLB Trade Rumors
Umps to begin in-park replay announcements, but COVID-19 may delay
MLB Umps May Soon Take To Mics To Explain Replays - CBS Baltimore
New Wireless Audio Lets MLB Umpires Make All the Calls Very Loud
An MLB umpire mocked a challenge into a hot mic, then overturned
MLB umpires could soon be using mic to explain replays