Key Features . Bluetooth 5.01.28 inch screenCompatible with devices running Android 5.1 and above or iOS 9.0 and above . Thin DesignIMILAB KW66 is a versatile all-in-one smartwatch it is thinner and lighter than ever before all while offering a bigger display screen.With 1.28” 3D HD Curved Screen in a 10.8mm think zinc alloy case that is light weight and rugged. The case back features IML treatment which provided a smooth look and comfortbale touch. 15 Day Daily UseSo much more battery life. Less to worry about. With IMILAB KW66 Xiaomi engineers wanted to deliver a full 30-day battery life standby time which equals to 15 days of typical daily use without sacrificing features. Customizable Watch FaceWith 1.28” 3D HD Curved Screen IMILAB KW66 expresses your individual character. Various watch faces can be downloaded and pushed from App freely to add and change new watch faces to meet your daily match requirements. Waterproof The fully sealed construction give the watch a IP68 waterproof rating. Protecting it from daily hand washing sweat and ensures protection in the pool. Health DataIMILAB KW66 always has your heart in mind. By monitoring your heart rate 24 hours it’s made for all the ways you move. We keeps an eye on your cardiovascular heath and your fitness with a bigger sensor. Get the most out of every workout. Whether you’re in water swimming or cycling in the gym IMILAB KW66 will track your progress and help you reach your fitness goals. With 13 sports modes it offers customizing tracking and coaching for daily activity.