Advanced optical heart beat sensor?? get continuous?? automatic wrist-based heart rate and simplified heart rate zones</br>Track workouts?? heart rate?? sleep?? calories burned?? floors climbed?? active minutes and steps</br>Wear on your wrist?? tracks your activity 24/7 and provides guidance and motivation to reach your activity goals</br>See call notifications?? daily stats and time of day on the LED display</br>Sync stats wirelessly and automatically to your computer and smartphone</br></br>Product Description</br></br>Features: <br>Invisible Screen Design?? 25 Grams?? Soft Rubber <br>Advanced optical heart beat sensor. No strap/no contact?? accurate/continuous heart rate monitoring during activities <br>Don't need to carry cell phones during sport activity. <br>Suitable for sport aficionado <br>Built-in high precision accelerometer?? it can operate independently?? and doesn't depend on cell phone sensors. <br>No constant cell phone connection requirement Information is available on bracelet Live display: Date?? time