Amazon.com : Polar Verity Sense - Optical Heart Rate Monitor Armband for Sport - ANT+ and Dual Bluetooth HRM - Waterproof HR Sensor with only One Button - Compatible with Peloton, Zwift
Amazon.com: Garmin fenix 5 Plus, Premium Multisport GPS Smartwatch, Features Color Topo Maps, Heart Rate Monitoring, Music and Contactless Payment, Black with Black Band : Electronics