College Baseball Was On the Clock and Chose an Electronic Wristband
College World Series: College Baseball Showing Signs of a Revolution With Catcher Wristbands - WSJ
Never Miss A Sign Wristband Sign System for Baseball and Softball — Never Miss a Sign
College baseball goes high-tech to send pitch calls to mound
High School Baseball: Wristbands more common as way to deliver signals
Never Miss A Sign Wristband Sign System for Baseball and Softball — Never Miss a Sign
How PitchCom changed the way MLB players communicate - Sports Illustrated
MLB Signs on to In-Game Usage of Wearable Pitch-Calling Devices
Franklin Sports Playbook Wristband for Football, Softball and Baseball - For Plays Plus Signs, Signal Call Arm Band, Great for Catchers Plus QB's and Adults
High School Baseball: Wristbands more common as way to deliver signals