LED light A light-emitting diode (LED) is used to illuminate the watch face. Stopwatch function - 1/100 sec. - 1 hour Elapsed time, split time and final time are measured with 1/100-sec accuracy. The watch can measure times of up to 1 hour. Daily alarm The daily alarm reminds you of events that recur every day, by emitting an audible signal at the set time. Automatic calendar with Date, Day and Month Once set, the automatic calendar always displays the correct date. 12/24-hour timekeeping Times can be displayed in either a 12-hour or 24-hour format. Mineral glass The tough mineral glass resists scratching.