This app is applied to The Car Bluetooth player. Through ble Bluetooth communication protocol, it can control the light color of the system, Radio station control, Bluetooth music playing control, U disk, TF card, song selection control, AUX Audio input control,etc. In addition, independent volume control can adjust the main volume of the system,the treble volume, the bass volume, and front and rear balance. Rich interface functions make it very convenient to operate the car Bluetooth player.