Product Description D116.SmartWatch D116 Fitness Smart band: If you're a fitness freak and love keeping a track of the calories burnt, sleep cycle, and heart rate, and then the D116 Smart Band is what you need. This smart band works as a heart rate tracker, fitness watch, and an activity tracker.D116 water proof Smart fitness Band compatible with Bluetooth or Heart Rate Sensor. It is compatible with devices having Bluetooth version 4.0 and below in smartphones, tablets, and PCs and also supports Android. Functions: 1.Heart Rate Monitor 2.Sedentary reminder 3.Calories 4.Time 5.Alarm 6.Anti-lost 7.Distance calculation 8.Step Monitor 10. Call Alert 11.Wrist sense Pre-requisites for use: Your mobile phone Bluetooth version must be Bluetooth 4.0 or higher Android version must be Android 4.3 or above. Working: To connect the smart band to the mobile phone, you need to connect the current mobile successfully via Bluetooth.