This easy to install USB CD Player by Automotive Integrated Electronics (AIE) is a quality solution enabling you to enjoy your Music CDs through your vehicle’s factory radio system. Installation: Unit has a single cable installation. CD player can be mounted both vertical or horizontal - under the car seat or under the dash or in any other accessible location, but not upside down or past the zero-degree vertical angle. Just plug in the connecting cable into your vehicles USB port on your factory radio and make sure to let the unit finish indexing for 10-20 seconds per CD to complete install and avoid set-up issues. You will retain full radio control ability. Compatible Formats are .WMA or .WAV, but not MP3: Some audio books are in MP3 format and will not play on this CD Player. Please refer to the Quick Reference Set-up Guide (included with unit and located on the site under images and User Manual PDF) and Troubleshooting Guide (located on the site under images & Installation Manual PDF), and detailed install instructions located on this site page under Product Guides & Documents “Installation Manual PDF” for help with successful installation. Unit dimensions: 5.75" X 5.75" X 1.5" Note: 1. Make sure you check the Vehicle Fit Chart (in images or User Guide PDF) to confirm your vehicles compatibility. 2. Make sure you are attempting the initial installation and connection WITHOUT the USB extensions (This is crucial). 3. Do Not install upside down or past the zero-degree vertical angle. 4. If after reading all the Installation Instructions and the Troubleshooting Guide, you are still experiencing issues, please call Customer Service at (442) 400-9489 for more assistance.