Slim, lightweight, and completely waterproof, the Polar T31 non-coded transmitter and belt set accurately transmits your heart rate data to your Polar wrist-top computer. As a result, it's easy to monitor your heart rate during training runs. This version of the T31 is non-coded. If you're concerned about crosstalk from other electronic devices, Polar sells a coded version of the T31 as well. The transmitter belt--which works with all current Polar wrist-top computers except the CS600 and RS800--includes a sealed transmitter and elastic strap.

About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.