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Xiaomi Mi Band 8 1.62 AMOLED Screen Fitness Bracelet With Blood Oxygen, 60Hz Fitness Traker, Smart Heart Rate Wristband Better Than Band 7 From Zw35255ww, $42.22

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Oppo wants you to track sleep with their smartband so as you can win another one

Is Xiaomi Mi Band 6 worth buying? Is there any new significant features compared to earlier versions? - Quora

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Xiaomi Mi Band 4 Review: The Best Fitness Tracker Under $50?