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LIVLOV V9 Bluetooth ANT+ Heart Rate Monitor Armband, Rechargeable HRM Sensor IP67 Waterproof Optical Armband Heart Rate Monitor for Peloton Garmin Polar Wahoo Strava Zwift DDP Yoga : Amazon.co.uk: Sports & Outdoors
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Optical sensor for heart rate monitoring developed for wearable devices - Electrical Engineering News and Products
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