Polar T31 Heart Rate Sensor Coded Brand New Product # 92053125 The Polar T31 Heart Rate Sensor Coded transmits heart rate data to polar monitors using 5kHz transmission and compatible gym equipment. The T31C features electro cardio gram (ECG) accurate transmitter and is designed for all weather conditions. It eliminates cross talk with other electronic devices in the same area and is individually coded to pick up heart rate monitor. The Transmitter is built to last, with a design that holds up to 2,500 hours of training usage. The transmitter belt includes a sealed transmitter and elastic strap. T31 Heart Rate Sensor Coded Features: T31C Heart Rate Sensor (Coded) Electro Cardio Gram Transmitter Chest Size: 25" to 54" Transmits Data to Monitors 5 kHz Non Coded Transmission Slim, Lightweight & Waterproof Prevents Cross Talk 2500 hrs Average Battery Lifetime No User Replaceable Battery