Apple Watch Series 7 (GPS, 45mm)  Smartwatch with aluminum case with Sport (PRODUCT)RED strap Regular Fitness tracker, O₂ Levels app, water resistant   With the GPS model answer calls and messages from the watch The always-on Retina display is nearly 20% larger than Series 6, making everything easier to see and use The most robust front crystal an Apple Watch has ever had,  IP6X dust resistance and swim-proof design Measure blood oxygen with a state-of-the-art sensor and app Do an ECG whenever you want, where you want Notifications if your heart rate is too high or too low, or your irregular rhythm New Tai Chi and Pilates workouts, and many others including Running, Yoga, Swimming and Dancing With Apple Watch, you measure how much you move every day and check your progress in the Fitness app on iPhone Sync music, podcasts and audiobooks Apple Watch Series 7 requires iPhone 6s or later with iOS 15 or later