NBEU 21 serves for displaying the line number, destination and additional information necessary to the passengers. It is usually mounted in the front, or on the side or in the back of the vehicle. All the displays are together conected in the LAN network, so the number of instaled displays is unlimited.

Display is produced in LED technology, the color of the dots is amber with 8,6 mm distance between each other. Vertical resolution is 21 dots. Horizontal resolution for standard models is 170, 160, 136, 128, 102, 96, 34 and 32 dots. It is possible to display line number and destination, next stop, arrival time and informational messages. Displey has 3 completely independent zones and in every of these three zones text or graphic can be displayed independently. This display can be called a HI RESOUTION solution.