We know there's no finish line. That's why we built our TIMEX IRONMAN R300 GPS watch for constant improvement. Overbuilt but not overpriced, this smartwatch is packed with a powerhouse battery, guided workouts from elite athletes and coaches, continuous optical heart rate monitoring and more, delivering a range of performance metrics to help you tune your workouts and reach your running goals. The crisp sunlight-readable display, simple user interface and robust mobile connectivity come together for a made-for-sports smartwatch that will have no trouble keeping up with you.