SportPlus Bluetooth 4.0 Chest Strap Heart Rate Monitor for iOS (From 7.1), Android (from 4.3) and Windows Phone, Optional with ANT+ And 5.3 Khz : Amazon.co.uk: Sports & Outdoors
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COOSPO Heart Rate Monitor Armband,Bluetooth ANT+ Armband Heart Rate with IP67,Optical Heart Rate Monitor for Peloton,Strava,Zwift,Polar Beat,DDP Yoga(One More Bands) : Amazon.co.uk: Sports & Outdoors
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Powr Labs Heart Rate Monitor Chest Strap – ANT + Bluetooth Chest Heart Rate Monitor with Chest Strap – HRM Run Bike… – Homecaregurus.co.uk