Polar Transmitters are an integral part of Polar Heart Rate Monitors. Positioned on the chest, they measure heart rate per minute in real time. Polar Transmitters are ECG accurate and fully water resistant making them the most effective exercise tools for measuring your heart rate.

Newly designed for increased comfort, the new Polar T31 Transmitter is 30% smaller and 25% lighter than earlier models including the T61.

The Polar T31 Coded Transmitter is designed to the highest of standards. Polar Transmitters deliver up to 2500 hours of operation or five years of use exercising 10 hours a week.

The T31C is 100% waterproof, has a 2500 hour battery life and, the coded transmission eliminates interference from other HRMs.

Please click here if you need a smaller or larger chest strap. This item comes standard with a Medium (35" to 54") chest strap.

The T31C is backed by the Polar standard 2 year maintenance free warranty.