Otherwise an excellent product, but with active use it only lasts a year before you need a new one.
Verified buyer

Compatible with all Polar heart rate sensors, this highly comfortable belt has soft textile material, slip-preventing silicone dots and an easy-to-use buckle. Does not include the transmitter. Over time, the belt will get contaminated with material from your skin and its performance will suffer. Just get a new belt, clip on your old transmitter and you’re ready to go!