Abstract: A security device consisting of a box-like container having a discharge opening extending through one face thereof and which may be attached to a door or window of a residence or office, or to or adjacent an area which would be attractive to unauthorized persons, said box-like container has therein a removable and replaceable cartridge containing a disabling gas such as tear gas or the like, or a liquid dye of a particular color, or a potent distinctively smelling gas or liquid to be discharged at an unauthorized person.