The phrm84 is a heart rate monitor watch with a 3d sensor that intelligently counts your steps, ignoring unwanted input. using the included belt, this watch will display your current heart rate while running. it’s also equipped with a wealth of training functions, including target time, speed, and heart rate modes. you can view your current and average speed, as well as calculate the amount of calories and fat you’ve burned during your workout. a stopwatch/chronograph, daily alarm, and time/date function are also built-in and running at night is no problem, thanks to the built in el backlight.