the present invention provides a dual diaphragm - type game caller of a size and shape suitable for inserting into a user &# 39 ; s mouth for support against the roof of the mouth so that free edges of two diaphragms retained together as a unit in a spaced - apart relationship can concurrently vibrate when impinged by pulmonary air exhausted by the user . the invention employs two diaphragms having a selected pattern of slits which allow the caller to produce a flutter or raspy sound effect which is sometimes desired by the wild turkey hunter .