The document describes the Polar RS300X Heart Rate Monitor Watch. It provides metrics for heart rate, speed, distance, pace, and calorie burn. It tracks your latest 16 training sessions and your last 16 weeks of training. It includes an OwnZone feature for individualized zone training by heart rate or pace, a fitness test, and auto lap splits. It also includes a Polar WearLink+ 31 coded transmitter and is compatible with additional accessories.