COMPATIBLE WITH ALL HEART RATE SENSORChest strap works with the most popular bluetooth and ant+ heart rate monitor sensor. Such as Wahoo, Garmin, Polar H7, Powr Labs, Moofit, XOSS, Mo-fit, Fitcent and more pitch equal to 45mm hrm. Not compatible Myzone, Polar H9 & H10, Polar FT7, Wahoo Tickr. ADJUSTABLE SIZINGWearable size from 65CM to 95CM with a max stretch to 130CM. The space of two snap button is about 45mm. If there is any compatibility issues, kindly contact us on the order page and we will reply you within 24 hours. COMFORTABILITYMade with a hybrid of silicone & fiber, our strap is designed for 10 hr+ comfort. The fabric of the strap can be removed and hand-washed as often as needed. RELIABILITYThe replacement chest strap can enhance and extend the life of sensor. The electrodes area can pick up your heart rate date quickly, providing stable connection and accurate data to help you maximize your workout. If you exercise regularly, we suggest you have an extra strap for changing. KINDLY REMINDSometimes for having battery and signal issues, the problem may lies on the chest strap. You just simply need the replacement strap that'll solve the problem. We suggest you change the strap regularly.