I've been trying out the Oura Ring for the past few days, and I think it might be the best bit of wearable tech I've come across (I've previously had Fitbits and Apple Watches. The ring tracks sleep incredibly well and also provide useful metrics on energy levels, activity etc. The sensors inside measure heart rate, temperature and... I don't know, stuff. But the whole thing is so much less obtrusive than a wrist-device and it doesn't start randomly talking to you because you said something that sounds like "Siri" midway through an important Zoom call.