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Polar T31 Non-Coded Transmitter Set, Model 3920132, Size M Medium 725882201320 | eBay
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DIY to the rescue: Polar HRM strap battery replacement | Mountain Bike Reviews Forum
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Polar T34 / T31 Non-Coded Chest Transmitter and Elastic Strap – HeartRateMonitorsUSA.com
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Polar T34 / T31 Non-Coded Chest Transmitter and Elastic Strap – HeartRateMonitorsUSA.com
How to replace Polar T31 Battery - YouTube
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How to replace Polar T31 Battery - YouTube
How do I change the battery to my heart rate sensor? | Polar USA
