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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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Garmin HRM-Pro Plus - Premium Chest Strap for Recording Heart Rate and Running Efficiency Values such as Step Rate & Ground Contact Time, Treadmill, ANT+ & Bluetooth Technology, Black : Amazon.co.uk: Sports