I have now tried four different smart rings from four different brands (reviews soon), and the new Renpho Lynx smart ring has been able to separate itself from the pack, practically, among other things. It does all the main things you want a smart ring to do, like sleep tracking, overall health monitoring, look discreet, but most importantly, it does not try to reinvent the wheel. After spending a few weeks with the Lynx smart ring, here is everything you need to know and why you should consider it.