A cover for a display device and a case for a communication device are provided. The cover comprises: external dimensions shaped to fit said cover in a case for said communication device; a top surface; a bottom surface; a non-opaque region adapted to cover said display device allowing a user to see said display device; and a region defining a top of an enclosure cavity for a speaker associated with said communication device. Sound holes in the cover are preferably present. A recess around the region is provided for fitting with a cover for the recess. A communication device comprising the cover is also provided. The case comprises: an exterior frame; a first opening in the frame; an internal wall defined within the exterior frame; a first cavity located in the internal wall; and an air channel to connect the first cavity to a region in the case.