i Pod (Click Wheel) models have a Click Wheel like the i Pod mini, but are larger and the hold switch is on the top-right side.i Pod (Click Wheel) models have a monochrome display.In June 2006, a new version of the i Pod Special Edition U2 was introduced that is based on a 5th-generation i Pod (also known as i Pod with video) with a 30 GB hard drive.In September 2006, a model based on the i Pod (5th generation Late 2006) was introduced.In June 2005, a new version of the i Pod Special Edition U2 was introduced that was based on an i Pod with color display.
i Pod (Dock Connector) models are referred to as third-generation i Pod models.
They continue to have the same controls as i Pod (Click Wheel) but now all models have a color display like i Pod photo—ideal for viewing album artwork and playing slideshows.
These are considered fourth-generation models along with i Pod (Click Wheel).
The capacity of the i Pod nano is engraved on the back of the case.
i Pod shuffle (3rd generation Late 2009) includes a three-position switch that toggles between off, play in order, and shuffle, similar to the original i Pod shuffle.
The last three characters of the serial number are W9G.