T31 Transmitter and Belt Set - 100% waterproof and 100% reliable. Polar Transmitters are maintenance free and last longer than any other heart rate transmitter on the market today. It features a one-piece sealed design that's 100% waterproof and the transmitter signal should last up to six or more years--even if you're exercising every day.
100% waterproof
Longest lasting heart rate transmitter on the market (6+ years based on 7 hrs/week)
