Oura ring size 7 gen 2 stealth black, used for a year, and now upgrading. See pictures for cosmetic scuffing. Ring works well and holds a charge for a couple days, longer in airplane mode. For best performance, set to charge a little each day. Download the Oura app and connect the ring to the charger, then to your phone via Bluetooth to get started. Loved this ring as a sleep and recovery tracker and to track basal body temperature for illness and period/cycle tracking.