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Amazon.com : Polar OH1 + Waterproof Optical Heart Rate Monitor with Swimming Goggle Strap Clip and Armband – HR Monitor with Bluetooth, ANT+ : Sports & Outdoors
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Amazon.com : Polar Verity Sense - Optical Heart Rate Monitor Armband for Any Sport and Exercise - ANT+, Dual Bluetooth - Swimming Mode - Compatible with Peloton, Zwift and Other apps and
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