The invention relates to a diffusion device, particularly for motor vehicles, said device including a recess (10) for a removable cartridge (130), containing one or a plurality of volatile agents, in particular fragrances； said recess (10) being configured to receive said cartridge (130), in a use position, and enable the removal of said cartridge (130) from said device； and said device including a system (400) for identifying said cartridge.
