This is an Oura Smart Ring! It is used but fully functional. Cosmetically, it has signs of wear common with normal use. Battery life is still great. I can get 2 days easily, but often charge it daily since the battery is so small. I am selling it because I find it is redundant to use since I already have an Apple Watch. If you do not care for smartwatches, use a smartwatch that does not have health features, or do not wear a watch at all, but still want health features, this is a great option! It feels like any other ring, but has some outdents in the interior for health sensors. I highly recommend checking out the official website for more details. Style: Heritage Color: Silver Size: 8 $200. Cash, Apple Pay, FB Pay, Zelle please. I can meet at and around SLAC and Stanford.