This was a stroke of genuis by the people at nintendo.It basically just a streering wheel shaped piece of plastic.Its very light and without the wii controller does not have an buttons or need for batteries.The wheel is white in colour and i would estimate it to be about half the size of a normal steering wheel. The wii controller fits snugly into the center of the wheel.The controller cannot be insterted incorrectly and I have found its best to have it completly lined up before trying to fit it into the slot or else you will struggle to get it in.Whislt playing games the steering wheel has to be pacing the general direction of your wiis sensor bar.However I have found that the wheel is very responsive to even the slightlest of movements.In games likes mario kart the tigger of the wii controller is available by pressing a button on the rear of the wheel. There is also another whole on next to the button which can be used to poke out the wii controller when you need it for another game.