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About
The Click Wheel is the component used by the majority of iPods to navigate the menus and control the iPod. It is touch sensitive, and does not have any physical buttons (aside from the center button). The Click Wheel was first introduced on the iPod Mini. The last device to offer the Click Wheel was the IPod Classic (7th Generation).
Resources
Wikipedia page on the Click Wheel: https://en.wikipedia.org/wiki/IPod_click_wheel