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Sigma Onyx Classic Heart Rate Monitor Simple to use, focused on the most important functions and a sleek design characterise the new Sigma Onyx Classic Heart Rate Monitor. Striking details make all the difference on this digitally coded heart rate watch. The most notable feature on the Sigma Onyx Classic Heart Rate Monitor is the very easy to read display with large figures and the watch's ease of use thanks to a flexible decorative ring instead of buttons. The programmable training zones and the calorie counter pave the way towards healthy training. |
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