The ZC CarSound App is mainly used for interactive control of Bluetooth speakers, Soundbar etc. The App gives the user full control over the Music Play, Controlling the source of music(Bluetooth,Music, EQ,Radio ,Light,UDisk,SDCard,AUX), Equalizer control, Color control of the light, Radio and AUX control. The app is used for Car and SoundBox. 1、Bluetooth: Bluetooth le search/connect/disconnect. 2、Music: Source Local/Demo for music play. 3、EQ:Equalizer.Volume,Bass,Treble and eq type select. 4、Radio: FM ,AM and frequency/channel search. 5、Mode: click mode button for device to auto mode select，not enter. SPDIF mode: Source SPDIF for music play. 6、LED：light color control. 7、USB：Source SDCard for music play. 8、SDCard：Source SDCard for music play. 9、AUX：Select source AUX for music play，not enter.