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
- 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
- Transfers heart rate information while swimming
