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CooSpo Chest Strap, Bluetooth & ANT+ Heart Rate Sensor, HRM Sensor, IP67 Waterproof, for Runtasic Pro, Wahoo, Elite HRV, Endomondo, Tomtom, black : Amazon.de: Sports & Outdoors
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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
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