Amazon.com : Heart Rate Monitor Chest Strap, iGPSPORT HR40 ANT+ and Bluetooth Waterproof HRM Sensor Compatible with Bike PC, Peloton, Zwift, Strava, Wahoo, Real-Time HR Data and Movement Dynamics in Exercise :
Mo-Fit Trio Heart Rate Monitor Chest Strap / HRM for Apple, Android, P – Engine Design Group