Oura Ring Gen 3 Horizon Size 12 - Very Good (B+)

Oura Ring Gen 3 Horizon Size 12 - Very Good (B+)

Oura Ring Gen 3 Horizon Size 12 is a pre-owned smart ring for buyers who want Oura sleep, recovery, and daily wellness tracking in a compact ring format. This unit is graded Very Good (B+), and 2use notes a few light scratches that are cosmetic only. The Gen 3 Horizon uses Oura’s fully round Horizon design, a lightweight titanium exterior, and a small underside dimple that helps sensor positioning. ([ouraring.com](https://ouraring.com/blog/introducing-the-oura-gen3-horizon-ring/))

Health and activity tracking

Generation 3 hardware adds green, red, and infrared LEDs, an extra NTC temperature sensor, and accelerometers. In everyday use, that translates into tracking for heart rate, temperature trends, blood oxygen sensing, movement, and detailed sleep analysis through the Oura ecosystem. ([support.ouraring.com](https://support.ouraring.com/hc/en-us/articles/360025570153-Previous-Oura-Ring-Generations))

Battery and durability

• Battery life rated up to 7 days, which matches the 168-hour specification in this listing. ([support.ouraring.com](https://support.ouraring.com/hc/en-us/articles/360046218953-Oura-Ring-Battery-Tips))
• WR100 water resistance, with Oura stating the ring is water-resistant to 100 meters. ([support.ouraring.com](https://support.ouraring.com/hc/en-us/articles/43395388251283-Product-Safety-Use))
• Bluetooth Low Energy connectivity for syncing with the Oura app on a compatible phone. ([support.ouraring.com](https://support.ouraring.com/hc/en-us/articles/43395388251283-Product-Safety-Use?utm_source=openai))
• Titanium construction for a durable, lightweight feel. ([ouraring.com](https://ouraring.com/blog/introducing-the-oura-gen3-horizon-ring/))

Condition at a glance

This is a size 12 pre-owned ring with a Very Good (B+) grade. The light scratches mentioned on this unit are cosmetic, making it a practical option if you want the Gen 3 Horizon experience in a clearly graded pre-owned device.