Designed for dedicated runners and endurance athletes. Heart rate monitor, chronograph, calorie counter and watch all-in-one. Heart rate monitor functionality includes % of max HR, target zone visual and audible alert, avg. and max HR for workout, and heart rate chest transmitter. Chronograph features stopwatch, 30 run exercise data, exercise file info with date and time. Calorie counter calculates calories/fat burned, displays visual calorie target and total calorie count. EL backlight and water resistant to 30m.