Attend calls and reply to messages using the GPS model with the latest inbuilt sensor you can measure your level of blood oxygen With an in-built ECG, you can track your heart movements Always-On Display 5GHz Wi-Fi and U1 Ultra Wideband chip use fitness app on your iphone to see your daily activity trends Apple Watch Series 7 With Call Function Touchscreen Notifier, Fitness & Outdoor Battery Runtime: Upto 18 hrs