I recently brought my oral exam behind me while using this Timer with stopwatch and backward running timer function. Advantage: - Large display (clearly visible even in a brightly lit room and not from a distance of 4-5 m) - Timer function (runs backwards and the transparent drops to the start button will flash green Once only one minute remains it will start to flash more quickly and from 0 seconds Counts the timer any time back up and it flashes red My Timer.. ran from 0 seconds about 20 minutes up in some reviews is something of 1 minute, that's right, he definitely did not count on -.. only the flashing stops) - Storing timer function (it can be stored 3 timer periods that can be activated by means of the three buttons at the bottom left just this saves the Entry of the timer time.) - Stopwatch function (. Here, the lamp does not blink The timer function simply runs from 0 seconds up) - Alarm tone (for the sound, there are three stages --- According - Normal - without sound --- without sound is really for the oral examination as this practice is not allowed, as a rule) ******* Disadvantage: With oral examinations usually a light mark is prohibited. This can NOT be disabled. Thus, I had to mask off the light for my exam. Thus, it went well. In the dark or in dark rooms but läuchtet the entire housing at the bottom slightly. Thus enough taping only bright exam rooms. By taping the timer was however allowed by the Commission.