One can identify their iPod's model by determining whether it navigates via Multi-Touch display, Control Pad, Click Wheel, Touch wheel, Scroll wheel, or Apple Earphones with Remote. Other physical features, like storage capacity or presence of a camera or clip, can determine the model as well.
A fifth-generation iPod touch is available in multiple colors and includes a FaceTime HD camera. The fourth-generation iPod touch is available in only black or white. Both the second- and third-generation iPod touch models have a similar outer appearance but are engraved on the back with a model number that identifies the generation. The first-generation iPod touch features a 3.5-inch widescreen display. This model also looks similar to the second- and third-generation models but does not include an engraved model number on the back.