The S410 will help you reach that elusive PR. Store your five key workouts and when you're done training, the Sonic Link technology and new PC Coach Light software let's you transmit your data into a PC for analysis. Now you can identify your weaknesses and turn them into strengths. Features: Download training data to your PC with Sonic Link technology (120 datapoints), OwnIndexS - Estimates your VO2 max, OwnCalS - Tracks energy expenditure, OwnCode - Personal transmission feature, Exercise Set - program the parameters of five key workouts (TZs, Timers, Recovery), view heart rate as a % of Max hr, 3 Target Zones and Timers, average and recovery heart rate, interval trainer, stores last full file and 5 summary files, new ultra-thin chest transmitter, low battery indicator on watch receiver, easy to use programming logic, and much more.