Grinnell TFX-912P Category : Grinnell Just like the rest of my Grinnell equipment, this smoke detector is from Brigham Young University.
Amseco BZ-54VT+RSD-24L Category : AmsecoThat rubber band is holding the strobe to the unit since there are no screws keeping it secure.
EST 882-2B Category : EST/EdwardsThis unit has an electronic horn rather than an electromechanical mechanism.