Open the APP, set the permissions, select the device at the Bluetooth device interface point, wait for the connection to succeed. APP can play music such as mobile phones, USB, SD cards and network resources. The basic functions of single playback, circular playback, random playback, up and down tunes, playback pause, drag-and-drop playback, volume adjustment and so on, as well as the functions of range, sound effect, tone, music equalizer adjustment and recording.