The **Connects2 CTAADUSB004** is a high-quality audio interface designed for Audi vehicles equipped with the **Quadlock connector**. It plugs directly into the original CD-changer port behind the factory radio, providing USB, SD card, and AUX (3.5 mm jack) connectivity while preserving original controls.

With this interface, you can play audio from flash drives, USB HDDs, MP3 / iPod devices, or SD/SDHC cards, and control folders/tracks using the factory stereo buttons or steering-wheel controls (if supported). It also supplies 5 V USB power to connected devices.