This is a twelve (number 12 in the type designation), the three-door (last 3 digit), urban, low-floor bus, which was offered with a gas or diesel engine.

The bus bodywork (manufactured under license of Italian company Mauri) is composed of a truss of the frame, made of thin-walled stainless steel tube.

The Prototype of Kronos 123 was made in 2004, and the same year was introduced on Brno fair Autotec (it was a gas version).

During the year 2005 went out of the factory gates six of these buses, including one with a diesel engine (designation Kronos 123 D).

Company TEDOM presented bus for demonstration sessions in many cities in the Czech Republic.