The app can be used together with the Bluetooth headset of the company to adjust the volume of the current headset and set the key functions, including double-click, triple click, long press, etc. These buttons include volume +, volume -, previous, next, long press voice assistant and other functions. When playing a song, you can go to EQ page to set the current song style. On the setting page, you can set the current prompt language of the headset, including Korean and English, and upgrade the headset firmware. The above is the function of the initial version of this app. Please know.