34 | KDC-U7053BT/ KDC-U7053BTLAppendixAbout the Audio file• Playable Audio filesAAC-LC (.m4a), MP3 (.mp3), WMA (.wma)• Playable disc mediaCD-R/RW/ROM• Playable disc file formatsISO 9660 Level 1/2, Joliet, Romeo, Long file name.• Playable USB devicesUSB mass storage class• Playable USB device file systemsFAT16, FAT32Even if the audio files comply with the standardslisted above, playback may be impossible dependingon the type or condition of the medium or device.• Playback order of the Audio filesIn the example of folder/file tree shown below, filesare played in the order of number from ① to ⑩.CD¡!2(1) ^ : Folder¡ : Audio file3¡$4¡"¡#¡P5 ¡%FolderAudio fileFor the online manual describing audio files, visitwww.kenwood.com/cs/ce/audiofile/. In this onlinemanual, detailed information and notes which are notprovided in this manual are provided. Make sure toread through the online manual as well.⁄• In this manual, the term “USB device” indicates a flashmemory or digital audio player which has a USB terminal.About the USB device• When the USB device is connected to this unit, it ischarged when this unit is powered.• Install the USB device in the place where it will notprevent you from driving your vehicle properly.• You cannot connect a USB device via a USB hub ormulti card reader.• Save backups of the audio files used with this unit.The files can be erased depending on the operatingcondition of the USB device.We shall not be liable for any damage arising out oferasure of the stored data.• No USB device comes with this unit. You need topurchase a commercially available USB device.• When connecting the USB device, use of theCA-U1EX (option) is recommended.• Normal playback is not guaranteed when a cableother than the USB compatible cable is used.Connecting a cable whose total length is longerthan 4 m can result in abnormal playback.