Taking comfort and function to another level, the new Polar WearLink is the first soft transmitter belt ever produced. With the exclusive Polar transmitter technology engineered right into the fabric strap, the WearLink will fit any body shape and allow full freedom of movement. It will change the way you exercise. The WearLink Transmitter features an electrode engineered into the fabric strap. Coded technology eliminates interference from other HRM users. Changeable battery, which has a 2-year lifespan, adds convenience while eliminating frustration. Replaceable fabric strap lasts over 100 machine washings, and the WearLink is water resistant. Available exclusively with the M61 and M32.