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Sigma R3 Speed Distance Heart Rate Transmitter Black Capacity_1 L If you're interested in these Short Size:XXL If you're interested in these then you'll almost certainly be wanting to run tubeless tyres Made in Taiwan The R3 transmitter enables you to measure your speed SPEED – DISTANCE – HEART RATE – The R3 transmitter uses an integrated three axis acceleration sensor to measure acceleration throughout the run and accurately measure speed and distance
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