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Amazon.com: Heart Rate Monitor USA Replacement Soft Strap (Works with Polar H7 H9 H10 & More / Works with Garmin Dual) Med/XXL : Everything Else
DIY - Replace Battery on Polar F2 heart rate monitor - YouTube
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Polar H9 User manual
Polar A3 Heart Rate Monitor Watch w/ Sensor Belt New battery Open Box EUC 725882027500 | eBay
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