"Built-in audio/video" - Plays sound, picture, and video from the iPod, controls and charges the iPod, displays song titles.

"Built-in audio only" - Plays sound from the iPod, controls and charges the iPod, displays song titles.

"Optional audio/video" - With optional cable/adapter, plays sound, picture, and video from the iPod, controls and charges the iPod, displays song titles.

"Optional audio only" - With optional cable/adapter, plays sound from the iPod, controls and charges the iPod, displays song titles.

"Optional audio only (no iPod controls) " - With optional cable/adapter, plays sound and charges the iPod, but does not control the iPod or display song titles.

"Built-in audio/video (no iPod controls)" -Plays sound and charges the iPod, but does not control the iPod or display song titles.

"Built-in audio only (no iPod controls)" -Plays sound and charges the iPod, but does not control the iPod or display song titles.

"Optional audio/video (no iPod controls)" - With optional cable/adapter, plays sound, picture, and video from the iPod and charges the iPod, but does not control the iPod or display song titles.