The SI smart watch tracks time, distance travelled, steps taken, calories burnt and monitors the heart rate. Sleep management feature allows managing sleep better. Blood oxygen can also be checked with this model. Features, like receiving SMS alerts and alerts on incoming calls, are available. Simple alarm setting features are available too. Ultra-fast charging, Anti-lost, Wrist recognition and low battery reminder are additional features available on this model. The S1 is also rain proof. The supported device versions are Bluetooth 4.0, Android 4.3+ and iOS 7.0+. This watch can be paired with YLeSmart app available on Google Play and the App Store.