-mac HMAC -macopt hexkey:$mshex -binary /tmp/a1
In terms of fit and comfort, they're slightly lighter than Viture and Xreal glasses (though they're much heavier than display glasses like Even Realities G2). I haven't had any problems with comfort, though, because of my larger face size, the fit is a bit awkward. I have to fiddle to keep the whole virtual screen in sight.
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