Radio trailers are 30-second advertisements for films that are played on the radio. They typically include a voiceover providing hints about the film's sounds and dialogue along with the film's rating and release date. At the end, any slogans are mentioned. Sound effects and music from the film are added to the trailer to create atmosphere. The example radio trailers described were around 25-30 seconds and featured voiceovers previewing the films along with clips and music to tease the films' content and generate interest in their releases.