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Amazon Watch Tracker : Useful Links
Amazon Halo review: A good fitness tracker — but is it too personal?
Unlike the Apple Watch or even most basic Fitbits, the Amazon Halo Band
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Amazon will track everything from physical activity to sleep.
Amazon.com : HuiNiu Smart Bracelet: Fitness Activity Tracker Watch Step Walking Sleep Counter Wireless Wristband Pedometer Exercise Tracking Sweatproof ...
Now, many high-end trackers and smart watches include ECG devices for tracking heart rhythms—one company, Withings, even promises sleep ...