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Polar Verity Sense - Bracelet with Optical Pulse Sensor - ANT+ Dual Bluetooth - Pulse Sensor for Sports with Just One Button - Compatible with Peloton, Endomondo, Zwift and Others Amazon Exclusive :
File:Polar RS400 Heart Rate Monitor.jpg - Wikipedia
Polar H10 Heart Rate Monitor - ANT + , Bluetooth - Waterproof HR Sensor with Chest Strap - Built-in