I don’t expect much from a device as small as a ring. There’s no room for a lot of hardware, so it only really needs to do a few things well. A sleep tracker that doesn’t get in the way of, well, sleeping, is my holy grail, and smart rings are a tantalizing option. Samsung’s Galaxy Ring promises to monitor my slumber and log my daily activity, and do so comfortably and unobtrusively, all for $400. That’s $100 more than its closest competitor, the Oura Ring, though the latter charges an additional $6 a month to
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