【Bluetooth 5.3, Call Function, SOS Emergency Contact】This smartwatch has a built-in high-performance speaker and microphone, allowing you to make calls simply by pairing it. You don't need to take out your phone during exercise or work. Adopting the latest generation Bluetooth 5.3, the communication range and connection stability are dramatically improved compared to Bluetooth 4. It also comes with a voice assistant, allowing you to call up Siri on your smartphone. In addition, in case of an emergency, you can make an emergency call using the SOS function. 【1.9-inch Extra Large Screen, Incoming Call/Message Notifications】The smartwatch adopts a 1.9-inch high-resolution large screen, providing a more precise and comfortable visual experience. It can display notifications from incoming calls, LINE, Twitter, Instagram, Facebook, and other apps, allowing you to quickly check important notifications. The watch has a touch screen with excellent touch sensitivity, and the screen automatically lights up when you raise your wrist, allowing you to see the time clearly even in the dark. 【Activity Tracker, Health Management, Exercise Management】Equipped with a highly sensitive sensor, you can easily check your body information just by wearing it on your wrist. The sports watch is equipped with 100 sports modes, recording activity levels such as exercise distance, exercise time, and calorie consumption in real-time, allowing you to understand your exercise volume more reasonably and develop healthy exercise habits. 【Abundant Functions, Customizable with 200+ Watch Faces】It has convenient functions such as an alarm clock, flashlight, pedometer, remote camera, music playback, weather forecast, stopwatch, and sedentary reminder, making daily life more convenient. You can download and change watch faces with 200+ types of watch faces in the dedicated app. Furthermore, you can also set your favorite photos as the watch face. 【Water Resistant, Long-Lasting Battery】The water-resistant function allows you to use it without worry in daily life, such as when washing your hands or sweating during exercise. It is not completely waterproof, so please refrain from using it while swimming, in hot springs, or bathing. It has a built-in long-lasting battery, which takes about 2.5 hours for a full charge and can be used continuously for 6-8 days, and 20-25 days on standby. The smartwatch supports Android 4.4, iOS 10.0, and Bluetooth 4.0 or higher.