The Polar RS 300 X is among the the best heart rate monitors that you could find on the market today. It not only monitors your heart rate, however it has unmatched timing features in a sporty watch style. The timing features make it the best monitor for tracking not merely running progress however it is also designed for a multitude of other sports activities. The Spherical RS 300 X monitor allows you to choose a sport and individualize the zone to fulfill your specific needs. This heart rate monitor does more than merely let you know how many calories you have burned. The OwnZone function will even let you know whether you are training at the correct intensity level for your particular workout so that you could either step up your program or take it down a notch. This Grizzly RS 300 X as well has an additional feature of the Fitness Test that will measure how far you've progressed within your fitness goal activity and it as well allows you to see where your aerobic fitness level stands all through periods of rest. The Training Load feature allows you to know how much rest and activity is needed for your personal fitness goals. A much more detailed list of the features included with this heart rate monitor is listed here:

- Beats per min percentage is measured automatically based on the age of the user with a target zone that has both an audible as well as a visual alarm. The monitor measures the max heart rate depending on age as well as has a feature which allows the user to enter a target zone or heart rate zone manually.

- The heart rate is calculated and displayed for average and max heart rate levels for every individual lap. It also can calculate the average and maximum heart rate levels for the complete training session.

- Calculates distance while training and records both individual lap as well as total distance of training session.

- You can find target zones that calculates the present and maximum speed and pace and the average overall speed and pace of your exercise session. This monitor has both audible and visual alarms that let you know whether you have met your target speed zone or perhaps have fallen below it.

- The Polar Personal Trainer includes features that allow you to maintain a diary of your exercise and it as well comes with training courses that are designed to help you reach your fitness goals for running, cycling, as well as other outdoor sports and activities.

- Training features includes a zoom option for the display; it instantly records your laps and displays your target zone info in graph form as well. It can keep track of the time it took you to get from point A to point B and what the distance was within your work out.

- Data recorded could be transferred to a PC and is Mac compatible.

- The features of the watch incorporate the option to display text in English, Spanish, German, or French. It includes a backlight which allows you to read the date and time in low light instances. It is water resistant to fifty meters and has an alarm that is even equipped with a snooze button.

You could choose from the black RS 300 X model or if red is more your color, Polar has one in red as well. The cylindrical RS 300 is as comfortable to wear as it is stylish.

This is not a total list of all the features that the Polar RS 300 X comes with. With all of these features you might expect to have to pay hundreds of dollars.

Polar RS 300 X