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. Temperature sensing Crash detection S8 SiP Low power mode Enhanced cycle tracking Brand Apple Battery life 18 h Compatible OS iOS Mobile OS watchOS Screen size 1.9 in Display AMOLED Internal memory 32 GB Wireless Bluetooth Case material Aluminum Band material Rubber Watch band color White Watch case color Silver Model name Watch Series 8 Model A2771 Manufacturer Apple Inc. Has touchscreen Y Cellular service plan No Plan-Unlocked Device Cell phone service provider GPS Watch band style Sport Band Has written warranty No Gender Unisex