For starters, Escaperoom Software displays a countdown timer on in-room screen(s).
In this way your players know how much time is left in the game. But you can do so much more!
An example of a room that has just started, including the game master control panel.
The game master, responsible for running the game, has a special control panel.
From here they can manage the room, send messages and manually run special events.
When timed events are triggered, or players in the room press a touchscreen button, the results are shown in on the screen.