The different user panel series from KROMA offer different connection options and user interfaces. The 5000 series is provided with all kinds of audio ports (analogue, digital and IP) and features graphic LCD keys with two lines of text and configurable colours. The 4000 series also counts with three types of audio ports, although the user interface is simplified with two LCDs to show the different labels. The 3000 series panels, as the affordable series, lacks the IP port and the LCDs, but keeps the rest of functionalities. Lastly, the BS3000 beltpack base stations can be use as cost-effective IP user terminals with 4 keys.