The watch supports wireless charging and can work for two weeks for light use after being fully charged. You can use a HUAWEI phone to reversely charge it when no charger is available. The watch can be connected to your phone over Bluetooth for calls. It can save the contact information of your families, friends, and colleagues for your convenience. The HUAWEI WATCH GT Series is designed for professional fitness and health management. The watch features a long battery life, runs HarmonyOS, comes with a lightweight app store, and offers a distributed easy travel and convenient lifestyle in all scenarios. The maximum heart rate varies depending on the workout mode. Maximum heart rates can be set using different labels to accurately calculate calories burnt in a certain workout mode. After Outdoor run mode is enabled for a period of time, the watch calculates and informs you of your current physical status, so that you can adjust your workout strategy in a timely manner to avoid injuries. VO2Max indicates the highest level of oxygen uptake and utilization per kilogram of body weight per time unit during a long period of intense exercise. It reflects the body's ability to intake, transport, and utilize oxygen, and is therefore an important indicator for assessing the ability to do aerobic exercise. If you get lost in an outdoor adventure, all you need to do is enable the route back and real-time voice guidance features, and then you'll be guided back. When you get lost in environments such as deserts and hills, switch to straight line navigation to quickly return to where you came from. The watch calculates the navigation distance and displays the remaining distance and estimated arrival time.