Polar H9 Heart Rate Sensor - ANT+ Bluetooth - Waterproof RF Sensor with Soft Chest Strap for Fitness Training, Cycling, Outdoor Sports & Universal Bike Mount for Polar Sports Watches :
Polar H9 Bluetooth Smart HR Sensor Black, Medium, Double Extra Large, Compatible with iOS And Android 6.0
Polar H9 Chest Strap / Heart Rate Monitor - health and beauty - by owner - household sale - craigslist