An audioguide is a fixed or mobile piece of apparatus which provides audio information at some form of exhibit.
The cast of The Audioguide - 2006 includes: Martina Amati as Girl
the ticket costs 12 euros and allows you to visit the colosseum,the roman forum and the palatine hill with the ruins of the imperial palace. With a few euros more is possible to get an audioguide. I know that is possible to do a guided tour organized by the same people selling the tickets but i don't know about the price