The Apple Watch Series 8 includes several enhancements focused on health tracking, safety, and user convenience, building upon the features of its predecessors. Here’s a breakdown: 1. **Temperature Sensor for Cycle Tracking**: The Series 8 introduces a temperature sensor that provides insights into sleep and menstrual cycle patterns. This feature enables more accurate ovulation estimates and retrospective cycle tracking, offering valuable data for users interested in fertility and health monitoring. 2. **Crash Detection**: Using advanced sensors, including a gyroscope and accelerometer, the Series 8 can detect severe car accidents. When a crash is detected, the watch can automatically contact emergency services, share your location, and notify emergency contacts if you’re unresponsive within 10 seconds. 3. **Sleep Stages Tracking**: Sleep tracking on the Series 8 has been improved, enabling users to see detailed data on sleep stages—such as REM, core, and deep sleep—providing insights into sleep quality over time. 4. **Always-On Retina Display**: The Series 8’s display is bright and always-on, allowing users to view notifications and time without needing to raise their wrists. This Retina display is also durable, with crack-resistant glass, making it ideal for active users. 5. **Low Power Mode**: This feature, new to the Series 8, extends battery life up to 36 hours by disabling certain functions temporarily while keeping essential ones, like activity tracking and heart rate monitoring, active. 6. **Advanced Health Monitoring**: The Series 8 includes heart rate tracking, ECG functionality, and blood oxygen monitoring, helping users monitor their cardiovascular health. It also provides regular reminders and insights into daily activity, like stand hours, movement, and exercise. 7. **watchOS Updates and New Apps**: Running on watchOS 9, the Series 8 gains features like enhanced workout metrics, improved navigation, and more customizable watch faces, which make the device more versatile and personalized for users. The Apple Watch Series 8 continues to focus on health and safety with its new features, making it a practical option for those looking for a smartwatch with robust health monitoring and daily utility.