The A3 is the least inexpensive model of the three. It is also the most basic. It allows you to view your old exercise data, along with the basic function of monitoring your heart rate. It is the easiest to use and is meant for beginner to intermediate exercisers.

If you are looking for something more advanced than the A3 then the A5 might be for you. It comes with a feature called “selfwalk test” which aids you in creating your original exercise plan. Some extra features are that it counts the calories that you lose, a backlight, and a program to help calculate your body mass index. It is the middle range monitor, and there are many more features to be had from the S410.

The S410 is a high end monitor with the ability to connect to your computer. When transfer your workout data to your computer you have a program analyze your workout. It has a stopwatch and a countdown feature. It can also store 5 different workout settings, but it also the most expensive.

Whatever your level of fitness, there is a Polar wireless monitor for you. If you are just a beginner, the solidly built A3 is for you. The more advanced athletes should choose the A5 or the S410 which are packed with features.