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To time a certain time interval, allowing the inclusion of audible and visual warnings, or only visual ones, at specific moments of the interval, in order to alert to the time already elapsed and to the time remaining.
This timer is useful for timing presentations, classes, meetings, and so on, in order to provide better organization of the exhibition as a function of time, or in other situations, such as in the kitchen, for example, where when using an oven, depending on of the recipe, it takes a few different time periods, one for preheating, one for a higher temperature, and one for a lower temperature.
Finally, it can be applied in many situations, in which you have to set different periods of time, just program the stopwatch with the necessary periods of time.