Size: 46.5 × 46.5 × 10.6 mm Screen: 1.39-inch circular AMOLED Resolution: 454 × 454, 326 PPI Material: Metal body with ceramic bezel Battery: Up to 14 days of typical use GPS: Built-in, with GPS, GLONASS, and Galileo support Sensors: Heart rate, accelerometer, gyroscope, compass/magnetometer, ambient light, and barometer Water Resistance: Suitable for swimming and water, not for diving Connectivity: Bluetooth 4.2 / BLE, no Wi-Fi Compatibility: Android 4.4 or later and iOS 9 or later Charging: Magnetic charging cradle/ring. It supports tracking steps, running, walking, swimming, cycling, climbing, and workouts, in addition to measuring heart rate, notifications, and sports training features.