I’ve only been wearing this ring for about a week now - so I’m not sure how accurate and everything is quite yet! I got this in hopes to track my sleep, and maybe see what factors (that I don’t already know about) can set off headaches for me! •Comes with a charger you can put on the ring itself & a charging case. (Charging the case is super fast) •Easy to use, you just slip it on. I got it in a size 10 and that’s what I normally wear on that finger and I would say it fits as it should! •Has a long battery life, when it came it was at 50% I believe? I’ve only charged it 1x after that and it’s still pretty much fully charged! •Seems pretty resistant to scratches. It comes with rubber covers to protect from scratches, but I’ve found that they make the ring turn on the finger more. •FREE TO USE NO SUBSCRIPTION. That was the biggest feature I was most excited for. Again, I haven’t had it for very long (only a week) so I can’t speak on the health benefits quite yet - but I love it so far!