Its no longer enough to train hard you have to train smart if you want the edge; The Timex Ironman Race Trainer™ Pro Heart Rate Monitor provides athletes with the necessary performance measurement data to succeed. The Timex Ironman Race Trainer™ Pro Heart Rate Monitor provides a complete solution for making serious training easy. With heart rate & training information downloaded to a computer performance can be reviewed graphed & enhanced. On the wrist the Timex Ironman Race Trainer™ Pro Heart Rate Monitor has a unique Sideways Ergonomic Design; the watch sits on the side of the wrist so the user has the Optimum Viewing Angle. So whilst running or cycling no movement of the wrist is needed to view performance data. Creating & tracking workouts on the Timex Ironman Race Trainer™ Pro Heart Rate Monitor is taken care of by the 50 Lap Multi-Session Recall Memory & the 5 Interval Timers which can be linked into your personal Heart Rate Zones. The Timex Ironman Race Trainer™ Pro Heart Rate Monitor is capable of storing 10 workouts; These can all be reviewed on the watch or downloaded on to the computer via the Timex Data Xchanger USB (Universal Serial Bus) where the performance data can be viewed in graphs & charts & compared to previous training sessions. The Device Agent software is available for download post purchase it is available for PC &40; Windows XP Vista Windows 7&41; or Mac &40; Mac OS X Snow Leopard 10.6.X or better&41; Heart Rate Data is available on the Timex Ironman Race Trainer™ Pro Heart Rate Monitor at the touch of button & can be viewed in any performance mode. With 5 Automatic Heart Rate Zones & 5 Customisable Heart Rate Zones training sessions can be optimised to the athlete. Also the Timex Ironman Race Trainer™ Pro Heart Rate Monitor makes use of a Recovery Timer giving the athlete immediate Heart Rate Data during & at the end of the Warm Down phase. The Timex Ironman Race Trainer™ Pro Heart Rate Monitor has a unique design combined with an innovative feature set which makes serious training seriously easy. Key Features Chronograph view option for time in zone View lap & split times in chronograph without heart rate monitor 5 manual zones Pop-up of recovery timer results Single-banner alarm mode with three settings 10-workout memory chronograph or interval based Target heart rate zones with time in zone & audible alerts 50-lap memory per workout with average heart rate per lap 100-hour chronograph with display options 5 interval timers with individual training zones Recovery heart rate timer with selectable durations Workout average & peak heart rate summary Calculation of calories burned Digital transmission eliminates cross-talk & interference Owner-replaceable batteries Water-resistant to 100 meters INDIGLO night-light with NIGHT-MODE