The bus name Katarina Jee refers to a character from the Estonian author August Gailit's novel Toomas Nipernaadi.

The library is a modified Volvo bus, customized in Finland by Kiitokori OY, which have been building such vehicles since 1965.

The bus interior and exterior design is by the Tallinn Central Library artist Kertu Sillaste.

Katarina Jee Mobile Library operates from Monday to Thursday in Lasnamäe, Haabersti, Nõmme and Pirita at 26 half an hour scheduled stops.

On Fridays the bus visits schools, kindergartens, youth and daycare centers and other public events.