Click Wheel

One of Apple's iPod control systems. the Click Wheel is present on the 4th Generation iPod, iPod Mini, iPod photo, iPod U2 Special Edition and some iPod nano generations.

This is where the select button is in the middle, the next song is the button on the right of the circular control system, the previous song button is on the opposite side, the menu (or back) button at the top, and play-pause at the bottom. To scroll down, move your fingers in the clockwise rotating way around the select button, and anticlockwise for the scroll up ability.

History
The original iPod featured a physically moving scroll wheel, with a center button in the inside and four buttons on the outside.

The second-generation iPod featured a touch wheel. It is the same as the first generation iPod, but instead of a physically moving wheel, it is a touch sensitive wheel.

The third-generation iPod moved the four outside buttons to the top, and replaced the push buttons with touch sensitive buttons.

The iPod mini, and later the fourth-generation iPod, made the four buttons push buttons again, and embedded them right inside the wheel. This is known as the click wheel.