The most important piece of exercise equipment you will ever own, with loads of features: - Continuous heart rate display - Wireless heart rate transmission - Dual LCD display of heart rate and exercise time - Personal target zone settings with high/low alarms - Calculates total time spent in target zone - Total elapsed time up to 10 hrs with stopwatch - Time of day and alarm - Water resistant to 20 meters Box and user's manual included. Batteries to be replaced.