What Are Radio Film Trailers?

The codes and conventions I found of radio trailers are as follows:

-Short audio clips from the programme included.

-Occasionally a music bed with music that is relevant to the programme in some way.

-Voice over is used. The voice over has to narrate and briefly outlines what the programme is going to be about. Sometimes there is a slogan used to hold the audiences attention.

-Average length of a radio trailer clip is 40 seconds.

-Mentions what channel it will be broadcasted on and what time.

-Often teases the audience to make them watch it.

-The often creates tension.