Internal Storage: 4GB Build: Titanium + Sapphire glass Battery life: Up to 14 days Display: 1.39 inch Processor: Kirin A1 + STL4R9 Connectivity: Bluetooth 5.1, BLE / BR / EDR Colors: Night Black, Nebula Gray OS: Android 4.4 or iOS 9.0 above Huawei Watch GT2 Pro Key features Voice calling Music remote Ambient temperature & humidity measuring Trajectory return function Moon phase tracking Sudden weather change warning Optical heart rate sensor Workout mode Golf mode Running VO2 Max Oxygen saturation detection Sleep monitoring Stress monitoring