Apple Watch Series 8 features advanced health sensors and apps, so you can take an ECG¹, measure heart rate¹ and blood oxygen², and track temperature changes³ for advanced insights into your menstrual cycle⁴. 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.Geek Squad Certified Refurbished products have been restored to like-new condition. All vital parts and accessories that would have been included with the original product are present, and our thorough inspection process ensures that the product is clean and in working condition. | Geek Squad Certified Refurbished Apple Watch Series 8 (Gps + Cellular) 45Mm Aluminum Case With White Sport Band | | M/L | | 2022) | Silver | Best Buy