This is a hardware device designed to assist the CMU KGB game of Capture The Flag With Stuff.
The device functions more or less as a glorified stopwatch under centralized control; see https://github.com/cmukgb/ctfws-timer-host/blob/master/protocol/protocol.rst for the gory details. Almost surely, though, you'll be interacting with these via http://timer.cmukgb.org/judge (a deployment of https://github.com/cmukgb/ctfws-timer-web).
Setup time display:
0 1 01234567890123456789 SETUP 2 : MM:SS.s NN⚑: R=0 y=0 messagemessagemessag START IN MM:SS.s
Steady state display:
0 1 01234567890123456789 GAME 2 : MM:SS.s NN⚑: R=NN y=NN messagemessagemessag JB n/N IN MM:SS.s
Last round display:
0 1 01234567890123456789 GAME 2 : MM:SS.s NN⚑: R=NN y=NN messagemessagemessag GAME END IN MM:SS.s
Game over:
0 1 01234567890123456789 CMUKGB CTFWS TIMER NN⚑: R=NN y=NN messagemessagemessag GAME OVER @ MM:SS
Game not configured:
0 1 01234567890123456789 CMUKGB CTFWS TIMER messagemessagemessag GAME NOT CONFIGURED