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boAt Xtend Talk Smart Watch with Advanced Dedicated Bluetooth Calling Chip, Built-in Alexa, 1.69" HD Display, Premium Design, vO2 Max,HR&SpO2 Monitor&Ambient Sound Detection(Pitch Black) : Amazon.in: Electronics
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VO2 Max Accuracy in Smartwatches TESTED! (Apple Watch, Garmin, Polar, COROS, Suunto, and More!) - YouTube
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