T31 coded transmitter

At the heart of your training is the coded T31 transmitter. Its purpose is simple: to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully waterproof and designed for all weather conditions 920135

• Built to last up to 2500 hours of training usage
• Prevents cross-talk from other electrical devices for accurate measurement of your training
• Non user replaceable battery
• Transfers heart rate information while swimming