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Change / Replace battery Polar transmitter belt T31 - YouTube
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Polar T34 / T31 Non-Coded Chest Transmitter and Elastic Strap
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User manual Polar M32 (English - 33 pages)
Change / Replace battery Polar transmitter belt T31 - YouTube
DIY to the rescue: Polar HRM strap battery replacement | Mountain Bike Reviews Forum
Amazon.com : Polar T31 Coded Chest Transmitter and Elastic Strap - Black : Heart Rate Monitors : Sports & Outdoors
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How to replace Polar T31 Battery - YouTube
Replacement Battery CR2025 for Polar Heart Rate Monitors & Transmitter
