Hi,
I am not sure I am the person to be answering this, but I have received my Apple Composite AV Cable to go with my Universal Dock, the cable the Apple Store webpage neglected to tell me I needed to plug into my Universal Dock. The Composite AV Cable has Red/White/Yellow phono plugs and also a USB plug at one "end," and the other end is the so-called 30-pin iPod cable plug. It fits into the bottom of the iPod and thus can output directly to a TV or to an amplifier for audio. That plug also fits into the back of the Universal Dock, and of course your iPod fits into the top. That cable also comes with a small plug-in charger with a USB output. I guess you may already have this cable (though you did not mention the USB plug?). If one end plugs into your iPod, then it will fit into the Dock, but it’s the one you need whether or not you have the Dock. The Dock itself appears to use no power. If your USB charger is plugged in, you can get output and charge your iPod (with or without the Dock) at the same time.
Now that I have it, I am disappointed with the Dock. I had also bought a Dexim dock (Richardsolo.com) but did not like it because it did not have full control. Well, neither does the Universal Dock.
They sure don't explain the Dock's functionality very well. One can infer from the Store webpage that the Remote controls everything, when in fact it controls only audio playback (next/previous song, and volume, and only from one preselected playlist), and the Remote controls nothing for video/photo playback except for video volume. I consider this item to be severely lacking. I expected start/stop/back/forward on photos and videos, and playlist selection on all media.
So for your $50 purchase of the Universal Dock, you are in effect getting only the Remote. The Apple Composite AV Cable is much more useful; you can sit up to maybe three feet from the TV and control
everything from the iPod in your hand. And of course if you have phono-plug extension cords, you can sit in the chair and control everything from the iPod in your hand.
If you accept the limitations of the Remote, then buy the Universal Dock.
Hope this helps!
D