The original NVIDIA Shield Portable (just called ‘NVIDIA Shield’ at first) was released back in 2013, and is still a very unique device. It had the form factor of a flip handheld console, like a Nintendo DS, but was much beefier and used NVIDIA’s own Tegra 4 chipset. The result was a beast of a gaming system that ran stock Android, and could stream games from your PC (as long as you had an NVIDIA GPU).
Unreleased NVIDIA Shield Portable 2 found at pawn shop in Canada was written by the awesome team at Android Police.