“Does it measure rem sleep? Does it measure o2? Why would I pre-order if I don't know the Specs. Samsung Galaxy Watch”
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The only external sensor it has is for heart rate. I don't think you can measure O2 at the wrist. Phones have the ability including the flagship S line to get O2 at the finger. It appears that Samsung is staying away from using sleep stages and instead reports sleep quality such as how much time awake or restless. It's probably using heart rate and motion.
Sorry, there was a problem. Please try again later.This was posted in Samsung Newsroom... In addition, the Galaxy Watch’s advanced sleep tracking[3] monitors all levels of sleep, including REM cycles. see link below. https://news.samsung.com/us/samsung-galaxy-watch-stay-connected-no-matter-where-you-are/ Samsung Health measures O2.
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