Turn iPhone4 into a racing game steering wheel

I've seen a lot of iPhone accessories, but none are as carefully dull as this. Maybe someone wants to turn their iPhone into a Wii-style steering wheel... but how will they take calls?

This iPhone 4 racing game steering wheel features a jack connection and external speakers, allowing you to play racing games while loudly enjoying your music. Both the iPhone 4 racing game steering wheel and the speakers use Nokia batteries, which can be charged via USB, but are sold separately.