HEART RATE CHEST STRAP - CooSpo tracks and captures real-time heart rate and calories accurately. It can pair with the popular training apps, GPS watches and bike computers\nBLE 4.0 & ANT+-Equipped with Bluetooth and ant+ technology, which can connect to your smartphone, GPS devices or gym simultaneously\nApp Compatible - Works with REVOOLA,Wahoo, Zwift, Endomondo, Runkeeper, IpBike, Nike+ Runclub, Peloton, elite hrv app, iCardio, DDP Yoga, Connect2, vzfit and others\nSPORTS WATCH COMPATIBLE - Garmin Vivoactive3, Garmin 235 watch, Garmin FR225, Garmin Fenix 3, Apple watch 4, Suunto Ambit 2 watch, Samsung Gear watch\nREPLACEMENT STRAPS - The standard length of strap for this product is 25 inches to 36 inches. If you need a smaller size or another color for a replacement strap, search for B08927CT7R or B0891LH7FN