Unit takes the CD music and digitizes it to a universal readable format, storing it on its built-in 12-disc virtual memory. Enjoy playing your favorite CD's when played through your vehicles factory radio system. Compatible Formats are .WMA or .WAV. This easy to install USB CD Player by Automotive Integrated Electronics (aie), is a quality solution enabling you to enjoy your cd's through your vehicles factory radio system. Unit has a two wire installation. Cd player can be mounted both vertical or horizontal - under the car seat or under the dash or in any other accessible location. Connect power & ground, then just plug in the connecting cable into your vehicles USB port on your factory radio. You will retain full radio control ability. Please refer to quick reference set-up Guide (included with unit) and make sure to let the unit Finish digitizing to complete install and avoid set-up issues.