Main features: Sleeping heart rate, sport heart rate, exercise intensity record and analysis, weight and dietary habit management, families and friends following... WannaFit can be used with Bluetooth wearable devices which can monitor and record steps, heart rate, calorie and so on. It will guide you to efficient exercises and a healthy life. Following families and friends to know them better and get closer. Enjoy your life with WannaFit!NOTE :When using running record will use the GPS.Continued use of GPS running in the background can dramatically decrease battery life."