At the heart of your training is the coded T31 Transmitter chest strap. Its purpose is simple:to transmit your heart rate to a Polar compatible receiver (including watches, treadmills and other exercise equipment). Slim and light, the ECG(electrocardiogram) accurate transmitter is fully water resistant anddesigned for all weather conditions
Built to last with up to 2500 hours of training usage
One piece moulded transmitter that is ECG accurate and 100% waterproof.
The coded version prevents cross-talk with other heart rate monitors. Good for team sport.
