Smartwatch with Bluetooth calling function (calendar with up to 50 contacts) 1.8" fully touch TFT screen, offers brighter colors with better energy efficiency 2 20mm straps included: blue silicone and blue nylon Multiple sphere designs available in the APP or customize your own design with images from your gallery Heart rate monitor APP Notifications Step count and distance 22 sports modes Voice assistant Bluetooth 5.3 Other functions: Blood oxygen monitor Women's Cycle Stress Weather Information Remote photography Remote music control Multilanguage Sedentary reminder Sleep monitor Battery life: 5 days in use/20 days in standby (depending on use, battery life may be shorter) Smart DCU app Compatible with Android 6.0 or higher and iOS 10.0 or higher