Key Features. Aluminium Case Track your steps monitor your heart rate & more! Car crash detectionwatch OS 9 Built-in GPS to track activity & share your location! Compatible with i OS Smartphones Water resistant to 50 metres. Smooth & seamless. The edge of design. Apple Watch Series 8 features a big brilliant Always-On display. Narrow borders push the screen right to the edge resulting in an elegant integration with the curvature of the case. Always-On Retina display. Take it all in. Get it all done. The bright Always-On screen makes detailed watch faces look stunning & easy to read even when your wrist is down. The larger display accommodates all your favourite complications & makes tapping typing & swiping a snap. Tougher than tough. The same innovations used to create the beautiful edge-to-edge Always-On display also help make it incredibly durable. A thick front crystal robust geometry & a flat base make it resistant to cracking. The Series 8 is swimproof with WR50 water resistance. Understand your cycle like never before. Apple Watch Series 8 has an innovative new sensor that tracks your temperature while you sleep so you can see changes over time. Cycle Tracking uses this data to provide a retrospective estimate of when you likely ovulated. When combined with your heart rate & logged cycle data youll get a detailed view of your menstrual cycle. Period predictions. Less of a question mark. Get enhanced period predictions with wrist temperature data. & now you can receive notifications if your logged menstrual data shows a possible cycle deviation like irregular or prolonged periods. Your Cycle Tracking data stays on your device & is encrypted when your phone is locked with a passcode Touch ID or Face ID. Dream machine. The Sleep app doesnt just keep track of your time asleep. It shows you how much time you spent in REM Core or Deep sleep as well as when you might have woken up. Take an ECG at any time. With the ECG app Apple Watch Series 8 is capable of generating an ECG similar to a single-lead electrocardiogram. Measure your blood oxygen. Its a breathtaking innovation The remarkable sensor & app in Apple Watch Series 8 allow you to take on-demand readings of your blood oxygen as well as background readings day & night. Makes taking your meds & vitamins run like clockwork. The Medications app helps you discreetly & conveniently keep track of your medications vitamins & supplements. & lets you easily log them from Apple Watch. Introducing Crash Detection. Help on automatic. For the first time Apple Watch Series 8 is able to detect if youre in a severe car crash. When a crash is detected Crash Detection can automatically connect you with emergency services provide dispatchers with your location & notify your emergency contacts.2 Crash Detection is an Apple Watch first using the combined power of an enhanced 3-axis gyroscope with high dynamic range & a new high g-force accelerometer microphone barometer GPS & an advanced sensor-fusion algorithm trained on over 1 million hours of real-world crash data. New ways to train. For your personal best. Squat spin stride you name it Apple Watch has a workout for it in the enhanced Workout app. & with new Workout Views youll be able to see more advanced metrics at a glance like Heart Rate Zones & customised intervals to keep you going strong. Heart Rate Zones. Quickly get a sense of your intensity level. Training zones are automatically calculated & personalised using your health data or you can create them manually..