The available time is set in minutes and seconds.
The time set by default is modified by pressing the arrows pointing up to increase and down to decrease.
Once established the available time you are in condition to start the countdown. This is done by clicking on the start button
The remaining time is displayed on the screen with giant numbers. When the time has finished, an audible sound begins to alert about this situation.
You can interrupt time count at any moiment by pressing the stop button.