HD Fit Pro is a companion app for smart watches, It contains functions such as step counting,, 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 and requires you to authorize SMS and call record permissions. Models such as S8 Ultra Max and Watch 8 Pro are smart watches supported by this app. https://www.youtube.com/watch?v=sr72dCKdo0w This link is the link address of the smart device.