APPS2Car Car Audio Adapter for Ipod Iphone Samsung Android Smartphone Cell Phone - SD Card USB AUX Jack Input - Universal Steering Wheel Control Interface for Volvo HU C70 S40 S60 S80 V40 V70 XC70 Built in high quality MP3/WMA decoder. Supports Mp3/WMA files of 8Kbps-320Kbps. Built in amplifier chip for CD sound quality music streaming. USB slot and SD card slot support control music files by your car radio panel or steering wheel. Support play mp3/wma music files from USB stick, SD card, SDHC, MMC, TF card. AUX slot fits all device with 3.5mm AUX function, such as iPod, iPhone, Android Phone, Blakberry, Widows Phone, Mp3, Mp4, PSP, iPad, Tablet etc. This digital music changer support 99 folders, each folders can read 99 files. But most OEM radio can only support 6-9 folders. PLUG & PLAY - Install via OEM CD changer port, integrated with the car, no damage to original car decoration. No singal interfere, no battery required. The yellow wire need to be conneted to 12V positive power source.