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Bluetooth Low Energy and ANT+ heart rate monitor platform allows OEMs to modify and rebrand advanced fitness and movement tracking wearables - nordicsemi.com
nRF52840 Module of mokosmart is on Nordic Semiconductor's list
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Bluetooth 4.1, 4.2 and 5 SoCs Meet IoT Challenges | DigiKey
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Bluetooth LE smartband tracks detailed fitness metrics for up to ten days between charges - nordicsemi.com
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Custom Firmware For Cheap Fitness Trackers | Hackaday