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User manual Polar T31 (English - 1 pages)
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DIY to the rescue: Polar HRM strap battery replacement | Mountain Bike Reviews Forum
How to replace a Polar T31 chest transmitter battery - YouTube
Polar chest strap battery removal and replacement - YouTube
Amazon.com: Customer reviews: Polar T31 Coded Chest Transmitter and Elastic Strap - Black
Change / Replace battery Polar transmitter belt T31 - YouTube
