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Amazon.com: HQRP 4-Pack Lithium Battery Compatible with Polar FT40 FT40M H7 H10 Heart Rate Monitor FT4O FT-40 FT-40M : Electronics
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Heart Rate Educational Starter Pack with Polar Wireless Sensors : ID 1077 : $65.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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Polar H10 Size M-XXL - Heart rate sensor for cellular phone, GPS watch, activity tracker - black - Walmart.com
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