Cable has Wii plug at one end; Component Video plugs, Composite video(can plug into almost all TVs) plug, stereo audio plugs at other end.
Cable length: 215cm from Wii plug to switch box, 15cm from switch box to AV plugs.

There is a switch on the cable to select between Component video & standard Composite video.

COMPONENT VIDEO:
Component cables provide excellent picture quality.
Component video carries the signal in 3 wires = Y(luminance),Pr & Pb(colour information), which improves picture quality due to several technical reasons.
Component video inputs on TVs are sometimes labelled simply 'DVD', see photo for an example of Component video sockets(order of colours is not important)

COMPOSITE VIDEO:
Composite video is the most common video standard, the vast majority of TVs have RCA sockets to match plug on this cable.
Component is less common, but gives a better picture(see info above). Composite video combines all of the signal, resulting in image degradation.


Plugs into the 'AV Multi Out' socket on the back of your Wii, just like the plain AV cables that come with the machine when you buy it.