INCarAudioSource.sourceUSB A source connected through a USB plug. Declarationcase sourceUSB See AlsoConstantsINCarAudioSource.sourceUnknownINCarAudioSource.sourceCarPlayINCarAudioSource.sourceiPodINCarAudioSource.sourceRadioINCarAudioSource.sourceBluetoothINCarAudioSource.sourceAUXINCarAudioSource.sourceMemoryCardINCarAudioSource.sourceOpticalDriveINCarAudioSource.sourceHardDrive