Polar T31 Coded Transmitter and Belt Set

The T31’s main purpose: to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully water resistant up to 100 meters (330 feet) and designed for all weather conditions. Built to last with up to 2500 hours of training usage. Prevents cross-talk from other electrical devices for accurate measurement of your training. No user replaceable battery.

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