The set consists of a sound module with connected speaker and matching figures. Thanks to its compact construction the sound module can be installed in the model railway layout, e.g in a building. The sound originates from the same place as in the real thing. It makes the typical noises heard on a track construction site as well as an automatic track warning system 'Rat-a-tack-tack Beep!' The connection is made via ausual 16V transformer. Suitable for AC/DC. Including connection and assembly manual.