Track your workouts and activity more precisely than ever — in the water, at the gym or on the road. See your metrics without raising your wrist on the enhanced Always-On Retina display. Go to new heights, lengths and depths with GPS, real-time elevation and the built-in compass for navigation. Close your Activity rings for a healthier day. And stay inspired to keep moving by streaming music, podcasts and audiobooks from your watch. GPS + Cellular model lets you call, text and get directions without your phone. Measure your blood oxygen with an all-new sensor and app. Check your heart rhythm with the ECG app. ConnectivityiOS operating system. Wi-Fi. Physical specificationSize: medium. Strap can be removed and replaced. Weight 39.7g. FeaturesWater resistant. Swimproof. Compatible with apps from the Apple app store. Answer calls. Read texts and reply to texts. Read emails. Receive social network notifications. View calendar and amend calendar. Displays weather. Music player. Heart rate monitor. Pedometer. Distance. Accelerometer. GPS. Calories. Sleep. , including charger. Manufacturer’s 1 year guarantee. EAN: 190199834217.