Here is a digital signage box with a 28″ LCD (1366*232 resolution) that supports 4K video. It comes with USB 3.0, Micro SD card, WiFi, and LAN functionality. The device supports 3G and GPS and can be managed using a tablet or PC.
Users can easily control what shows up on their display. Such a 4K signage box could prove useful for businesses. The above video shows how this works.