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 and other
Polar H10 Bluetooth/ANT+ Heart Rate Sensor Black X-Small/Small - Walmart.com
Polar H10 Heart Rate Monitor HRM Sensor with Pro Soft Chest Strap Bluetooth ANT+ | eBay