The PlayStation Portable was Sony's first handheld game console. Here's a rundown of each device, with links to detailed specifications.

The PSP was first released by Sony in Japan in 2004 and was considered the most powerful handheld video game console when it was first introduced. It received several model refreshes before being replaced by the PlayStation Vita in 2011. While all of Sony's PSPs — with the exception of the PSPgo — essentially shared the same form factor, there are a few key differences.

It may seem a little heavy and unwieldy now, but when the PSP first came out it was sleek, shiny and powerful. The screen was bright enough and large enough to make watching movies on the go a great experience, even if the games weren't as graphically detailed as their full-size console cousins. The original PSP was intended as a multimedia device, with the hardware to handle movies, music, photos and games.

The second PSP model was dubbed the "PSP Slim" (or "PSP Slim and Lite" in Europe) by fans because it significantly reduced the thickness and weight of the original device. Hardware changes were fairly minimal, but included an improved screen, a better UMD door, and a faster processor. A few switches were moved to accommodate the thinner silhouette. Sony also added Skype to the firmware, allowing the PSP to even be used as a telephone.