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Sigma Sport Accessories, R1 DUO Heart Rate Transmitter (ANT+/Bluetooth Smart) incl. COMFORTEX+ : Amazon.se: Sports & Outdoors
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Sigma Sport R1 Duo Ant+/ Bluetooth Smart Heart Rate Transmitter with Comfortex Strap : Amazon.co.uk: Sports & Outdoors
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Amazon.com : Sigma Comp Part Ant + HR Chest Strap R1 Transmitter : Cycling Electronics Accessories : Sports & Outdoors
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