Vectrex purists are probably going to complain that this Micro Vectrex isn’t using an actual cathode ray tube display (they definitely existed at this scale) but instead features a vertically aligned 2.5-inch LCD. Both the replica’s housing and its controller (which isn’t at a matching scale so that it’s still usable) were 3D printed with the models available on Thingiverse for download if you want to try making your own own, but you’ll have to shell out for the modern electronics inside: a Raspberry Pi 2 Model B.
Although the micro Vectrex isn’t compatible with the original console’s game cartridges or the weird plastic screen overlays that were used to artificially add some color, a RetroPie Vectrex emulator appears to do a fantastic job of recreating the unique look of the Vectrex’s graphics, including simulating those color overlays. And while this version still isn’t battery powered, it draws all the juice it needs from a USB cable, so grab a portable charger and you’ve got yourself the best portable console the early ‘80s could muster.