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The 1st Gen iPhone (aka 2G) features a silver back, comes in 4GB or 8GB, and was released July 2007.

The iPhone 3G features a black or white backplate, comes in 8GB or 16GB, and was released July 2008.

The iPhone 3GS is almost identical to the iPhone 3G, but features built in video camera and compass capabilities, and was released June 2009.

The iPhone 4 was released 2010, sports retina display, front and rear facing cameras, and a glass back plate.

The 1st Gen iPad comes in two versions. One with Wi-Fi capabilities, and one with Wi-Fi + 3G.

The 5th Gen iPod comes in 30GB, 60GB, and 80GB hard drive sizes, has a plastic black or white face plate, and was released in October 2005.

The iPod classic comes in 80GB and 160GB hard drive sizes, has a brushed black or aluminum face plate, and was released September 2007.

The iPod touch has a glass, touch screen display and comes in 8GB, 16GB, 32GB. The 2nd and 3rd Gen iPod touches feature a built in speaker and external volume control, while the 1st Gen does not.

The 1st Gen iPod nano comes in 1GB, 2GB or 4GB, has a plastic black or white faceplate, a silver backplate, a color screen and was released September 2005.

The 2nd Gen iPod nano comes in a variety of colors, a color screen, 2GB, 4GB, 8GB, and was released September 2006.

The 3rd Gen iPod nano is more square-shaped in comparison to the other nanos, comes in 4GB or 8GB, has a color screen that plays video, and was released September 2009.

The 4th Gen iPod nano has a taller screen than its counterparts, a curved surface, skip song by shake feature, plays video, comes in 8GB or 16GB and was released September 2008.

The iPod Photo comes in only white, has a color screen (but no video), comes in 20GB, 30GB or 60GB and was released February 2005.

The 4th Gen iPod comes in white only, has a monochrome screen and gray scroll wheel, comes in 20GB or 40GB and was released July 2004.

The iPod mini comes in a variety of colors, has a monochrome screen, aluminum housing, comes in 4GB or 6GB and was released January 2004 (not to be confused with the small 2nd Gen iPod nano).

The 3rd Gen iPod comes in only white, features four navigation buttons above the scroll wheel and a monochrome screen, comes in 10, 15, 20, 30 and 40GB, and was released April 2003.

The U2 iPod comes in two models. 5th Gen U2: just like the 5th Gen iPod (see above) but with black face and red scroll wheel. 4th Gen: just like the 4th Gen iPod (see above, but with black face and red scroll wheel.

The Original iPod, also known as the 1st or 2nd Gen iPod, features a monochrome screen, white scroll wheel with navigation button that surround the wheel, comes in 5GB or 10GB, and was released October 2001.