DESC: This expansion module-ready receiver gives you the option of extending your digital lifestyle into your vehicle with the first expansion module (CY-EM100U, sold separately) designed specifically to link car audio equipment with a variety of digital devices. Plug in your iPod®, camcorder, video game system, satellite radio receiver, DVD/CD changer, or Bluetooth® Hands-Free Cell Phone Kit (each sold seperately) — all at the same time! Each of these devices can also be individually connected directly to the head unit.