APPS2Car USB SD AUX Car Digital Music Changer for Honda Accord Civic Odyssey Pilot CRV Fit Element S2000, Acura MDX TSX RDX (fits select OEM Radio) - Auxiliary Input Auto iPod Adapter MP3 Connector Works as a replacement of CD changer. Plays music on your iPhone or iPod through car audio system. Hi-Fi guaranteed along with no signal interference. PLUG & PLAY. Directly connected via CD changer port. No battery required. Straightforward toinstallanduse. AUX port works for most devices with 3.5mm AUX function, e.g., iPod, iPhone, Android Phone, Blackberry, Widows Phone, Mp3, Mp4, PSP. But only supports audio input, does not support control of music files by car radio panel or steering wheel USB Port and SD card port support control of music files by car radio panel or steering wheel. Supports USB 2.0 stick, SD card, SDHC, MMC, TF card up to 32GB. Built in high quality MP3/WMA decoder supports Mp3/WMA files of 8Kpns-320Kbps. Holds up to 99 folders, each of which contains at most 99 files. But most OEM can only support 6 to 9 folders.