Water-resistant watch features pulse sensors for accurate and continuous heart rate monitoring. Activity tracker features pedometer to count steps and calories burned per day; automatically stores last 50 days of steps. Main display includes date, weekday, hour, minute, second format; choose from 12-hour or 24-hour time mode. Stopwatch function measures down to a hundredth of a second, up to a maximum of 59:59:59; also provides split time function. Other features include backlight display for night use, 2 custom alarm times and/or hourly chimes and countdown timer function.