Meet the MeLE Digital Signage Box: a 4K display system that lets you load videos on it and manage it from your tablet or PC. It comes with WiFi and LAN functionality. The device also supports GPS and 3G connectivity. You get a 28″ display at 1366 x 232 resolution, USB 3.0, Micro SD card slot, and more.
The above video shows what this signage box has to offer. More information is available here.