The 510 was designed for the ultimate crosstrainer or triathlete. The added cycling features let you track performance in all disciplines. The new distance based interval function helps guide you through your toughest workouts on the bike. With the Sonic Link technology and the new advanced PC Coach light software, you can download your heart rate and cycling data, as well as maintain a training log. Swim..Bike?????Run..Download. New dual position bike mount included. Features: wireless cycling functions/speed and distance (Cadence optional), download training data to your PC with Sonic Link technology (120 datapoints), OwnIndexS - Measures 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, lap splits with avg. Hr, stores last full file and 5 summary files, enhanced screen for handlebar viewing, new ultra-thin chest transmitter, low battery indicator on watch receiver, and full function stopwatch and everyday watch.