Polar Strap für T31/T61 M Replacement strap w/o sensor | Conrad.com
DIY to the rescue: Polar HRM strap battery replacement | Mountain Bike Reviews Forum
Polar T31 Coded Chest Transmitter and Elastic Strap - Black
Other Sport & Leisure - Polar AXN300 Outdoor computer / Heart rate monitor was sold for R1,000.00 on 2 Oct at 22:30 by noar in Johannesburg (ID:5389290)
Polar chest strap battery removal and replacement - YouTube
Polar T31 Coded Chest Transmitter and Elastic Strap - Black
POLAR T31 & T61 Replacement Strap Black - MEDIUM SIZE - OEM New | eBay
How to replace a Polar T31 chest transmitter battery - YouTube
Changing battery to Polar H7 heart rate sensor - YouTube