All Nebulizers come with a medicine kit which contain a medicine bottle that is a crucial part to create the aerosol mist. The integrated baffle in the medicine bottle means that the baffle is fixed in the medicine bottle so that you can't lose the baffle. Losing the small baffle can stop nebulization. This is a really important feature because the baffle is a tiny part that can be lost very easily. Hence all Medtech Nebulizers come with a Fixed Baffle in their Medicine Bottles.