Apple Watch Series 8 features advanced health sensors and apps, so you can take an ECG, measure heart rate and blood oxygen, and track temperature changes for advanced insights into your menstrual cycle. And with Crash Detection, sleep stages tracking, and advanced workout metrics, it helps you stay active, healthy, safe, and connected. See Dimension section below for band sizing information. | Refurbished Excellent | | Apple Watch Series 8 (GPS) 41mm Aluminum case | | 2022) | Midnight | Best Buy