The document provides information on conventions for radio trailers or commercials for films. It notes that radio commercials must sell the product using just sound and the listener's imagination since they do not have video. It then lists some common conventions for radio film trailers which include using a deep male voice to provide reviews of the film and a short summary of the plot, along with stating the age certification. An example script for a radio commercial is also provided that uses sound effects and informs listeners about fire safety and testing smoke alarms when changing clocks back in the fall.