RG300 Handheld Linux Gaming Console
CPU: JZ4760B 528MHZ MIPS (Dual Core) RAM: 128MB RAM (DDR2) Display: 3 Inch 960×480 (IPS) Storage: 2 SD-Card slots Battery : Li-polymer 1800mAh battery
The RG300 is a portable gaming console in vertical format, based on the OpenDingux project. The devices has 2 SD-Card slots where one is for the root filesystem and the other for external data like roms or videos.
RetroFW seems to be the best firmware as of now and can be obtained here: RetroFW Releases
The RetroFW project on GitHub provides the toolchains (buildroot) to port your own software. However the image itself seems to be built in private with no source code disclosed.
To make the menu look more nicely, one can install a theme for gmenu2x: Comic Book Theme