The S725X™ is an upgrade to the popular S725™ with the same sleek carbon fiber look and even more training options than before. It is the only complete cycling system that combines heart rate with speed, distance, altitude, ascent, cadence and optional power output. It also features mobile connectivity and Polar OwnOptimizer™ recovery test. Cross-training athletes you can measure running speed and distance with the optional Polar S1™ Foot Pod. The S725X™ also lets you record personal performance, optional running and cycling data plus training conditions like altitude or temperature, then analyze your performance when you download via Infrared technology directly to your PC. The most complete cycling computer just got better.