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HQRP Battery (4-Pack) compatible with Polar RS300X Heart Rate Monitor (2 Batteries for Training Computer + 2 Batteries for Transmitter Polar WearLink) + Coaster Standard Batteries & Chargers - Newegg.com
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HQRP 4-Pack Battery for Polar s3 Stride Sensor, WearLink, S210 S410 S610 Heart Rate Monitor - Walmart.com
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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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