Water proof Smart fitness Band compatible with Bluetooth or Heart Rate sensor,It is compatible to devices having Bluetooth version 4.0 and below in smart phones, Tablets and PC's and also support Android and IOS.It has features such as calling function which enables you make a call and disconnect it, you can also send and receive messages through it but only supported to android Phones for which you need to download app. Features:OLED Time Display 24 Formula: Check the current time. Steps: Record your steps. Mileage: Mileage of sports. SMS: Bluetooth Sync Reminders, SMS Notifications. Stand by time: 300 hours. Calories: Calories of sports. Power: Displays the current power. Heart Rate Sensor: Check your heart rate.