HIYD ultrathin health tracker attaches to the back of regular watches (Crowdfunding)

HIYD is a compact and thin (2.7mm) health and fitness tracker that attaches to the back of a regular wristwatch and looks very similar to the Azume One, which we wrote about last month.  Developed by San Jose-based HIYD, the device adds heart rate, sleep, recovery, and activity tracking to traditional watches using a removable microsuction mechanism. It features optical sensors for heart rate, heart rate variability (HRV), and blood oxygen (SpO2) monitoring, along with an accelerometer and skin temperature…

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