This is the latest model of the Oura Ring, the "Oura Ring 4." It's the 4th generation model with improved accuracy in sleep tracking and condition management. This ring is a replacement from the official support, as the previous ring I was using broke within the warranty period. I opened it and used it for a few days to confirm its functionality. It works without any issues. All accessories are included. No claims and no returns accepted. 【Product Information】 Model: Oura Ring 4 (4th Generation) Color: Stealth Size: US 11 (Size 11) Retail Price: 52,800 yen (tax included)