QFit is a companion app for smart watches, It contains functions such as step counting, heart rate, sleep, exercise and so on. Call reminder, SMS notification is the core function of the app.The usage scenarios are as follows: When a user's phone calls or get a message, we push the corresponding information to the user's smart wearable device via bluetooth 4.0. This function is our key function which can only be achieved by using this permission. Models such as R3L and Y39 are smart watches supported by this app.