Vdo is a smart watch supporting APP, including steps, heart rate, sleep, exercise and other functions. Call reminder and SMS notification are the core functions of APP. The usage scenario is as follows: when a user calls or receives a text message, we push the corresponding information to the user's smart wearable device through Bluetooth 4.0. This function is our key function, and it can only be realized by using phone, contact and SMS permissions. Models such as Watch Grace (M4) are smart watches supported by this application.