Polar USA T31 Non-Coded Chest Transmitter

The T31 is fully water resistant making it great for swimmers, it delivers the most effective measurement of your heart rate while involved in water sports.

Unlike the T31 coded version It doesn’t have the benefit of coding for interference-free transmission.

The average battery lifetime of Polar T31 and T31C Transmitter is 2500 hours of use.

Non Replaceable Battery, when the battery dies, you will need to replace the whole heart rate sensor. 

Polar T31 Non-Coded Chest Transmitter and Elastic Strap works with most treadmills & elliptical machines.