Amazon.com : POLAR T31 Replacement Elastic Strap (X-Small), Black : Heart Rate Monitors : Sports & Outdoors
Amazon.com : Polar T31 Coded Chest Transmitter and Elastic Strap - Black : Heart Rate Monitors : Sports & Outdoors
Polar T31C Transmitter + Elastic Black, One Size : Amazon.com.be: Sports & Outdoors
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User manual Polar T31 (English - 1 pages)
User manual Polar T31 (English - 1 pages)
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How to replace a Polar T31 chest transmitter battery - YouTube
