The Polar RS300X heart rate monitor watch can help you increase the intensity and efficiency of your daily workouts. With the RS300X, you can track and monitor not only your heartbeat, but your target zones, calories burned, lap times, duration of exercise and more. The RS300X comes with a chest strap monitor that is easy to wear and helps accurately monitor your heart rate. Out of all the heart rate monitor reviews, the RS300X wins the Top Ten Reviews Silver Award for having numerous tracking features and convenient alarms.