Generation 3. Bought September 25, 2023. Pre-owned, has some scratches that can only be seen from very close up-see pictures, has "plateau" design so there's a flat ridge on one side of ring, Size 8, comes with charger, please note the box is from another new ring I purchased, and not the Heritage ring, but the box is included Durable titanium, PVD coating, non-allergenic, and seamless inner molding. Over time, Oura Ring can get minor scratches with normal wear and tear, Up to 7 days of battery life, with full charge in 20 to 80 minutes, Oura Ring is water resistant, The Oura App is available in English, Finnish, Japanese, German, French, Spanish, and Italian, supports metric and imperial units of measurement, and integrates with 40+ apps, Bluetooth