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Amazon.com : Polar H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, X-Small/Small) : Heart Rate Monitors : Sports & Outdoors
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How to get the battery out of this heart rate monitor? I can't even fit a paper between the battery and the case : r/howto
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Amazon.com : Polar H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, X-Small/Small) : Heart Rate Monitors : Sports & Outdoors
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Amazon.com : Polar H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, X-Small/Small) : Heart Rate Monitors : Sports & Outdoors
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