Polar T31C Chest Strap Black Chest strap

Heart rate sensor. Slim, light and fully water resistant transmitter that prevents cross-talk from other electrical devices for accurate measurement. At the heart of your training is the coded T31. Its purpose is simple: to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully water resistant and designed for all weather conditions