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Set your total time and up to two heads up notifications, then run it full screen so the whole room can read the clock.
total time
custom time
notification #1
Single blip. Time remaining.
notification #2
Double blip. Time remaining.
Time's up sounds four blips and turns the screen red, then keeps counting up with a soft reminder blip every 30 seconds until you stop it. Leave a notification field empty to switch it off.