Polar T31 Coded Heart Rate Transmitter and Belt Set

The Polar T31 Coded Transmitter transmits your heart rate to your wrist unit. It's designed for all weather conditions and is water-resistant and water-resistant. The transmitter belt works with all current Polar wrist-top computers except the CS600 and RS800 and can hold up to 2,500 hours of training usage. amazon.com The first "intensity training" device was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. For best results, thoroughly moisten the back electrode areas of the transmitter with water. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. Keep in a cool and dry place. If you are finished with your workout, remove your transmitter and rinse it with warm water and wipe with a dry towel. The Polar logo is in the upright position.