When I bought this Head Unit, the pictures did not do it justice. I was willing to buy it not expecting it to be half as good as it actually is! The main function of the head unit is to actually operate as the controls for your iPod. Rather than simply plugging it in via a lead, your iPod is housed inside. It comes with a variety of adaptors to make sure that your iPod isn't damaged during insertion/removal. The dial on the right controls volume, while the dial on the left allows you to change songs. There is also the option to shuffle, repeat all, repeat one etc just like your iPod. to access the menu (like the one on your ipod... playlist, ...  Read the complete review