Oura Gen3 Heritage Stealth US13 Ring

Men's size 13. Includes warranty through 2024. The Oura Ring uses body temperature, blood oxygen levels, heart rate and heart rate variability, and breathing rate to determine which stage you're in at any given moment while you sleep — and how long you spend in that stage before transitioning to the next. This was purchased is 2022 and used twice. Does not include membership.