The pump horn includes a chamber that can be filled continuously and indefinitely by a push/pull slide that when pushed into the chamber forces pressurized air through an attachable member, a tube, a sound producing device, and an amplifying unit to produce a loud blast sound. The push/pull slide includes a screw in piece at the end which is secureable to the attachable member within the chamber for releasable securement of the push/pull slide. This allows compact carrying and storage.