Milwaukee Brewers pitchers have stopped using PitchCom system mostly
MLB will allow teams to use PitchCom, the anti-sign-stealing device, in 2022 season - The Athletic
PitchCom -- aimed at foiling MLB's would-be sign-stealers -- is (mostly) winning over the skeptics - ESPN
New Earpiece Technology Simplifies Pitching Signals For Brewster Catchers
Rays praise PitchCom electronic pitch-calling device
MLB looking at electronic system for calling pitches
What is the New PitchCom Device and How Does it Work?
How baseball's PitchCom is changing the college game, LSU
MLB Approves Wearable Pitch Calling Devices
MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps?, BU Today
MLB gives OK to electronic pitch calling - The Globe and Mail
Catchers no longer need educated fingers to flash signs: Guardians takeaways
Mets give mixed reviews of new PitchCom device for pitch signals
Farewell to the fingers? Giants give signs-free technology a tryout
MLB Tests Electronic Voice Transmitter for Catchers to Signal Pitchers