Often if there is a small activity to do in class you need to set a time limit, which you forget about and it stretches and the rest of the lesson has to get readjusted to accommodate. Besides the audience don’t keep track of the time and run over, or they are too busy keeping track and don’t concentrate on the task.
This is when the Countdown Clock comes into play.
All it does is display a clock counting down and sounds an alarm at the end, but boy is that effective when projected onto a screen. You just need to type in the length of time you want it to run for.