Wheelock AES-DL1-WS-24 Category : Wheelock Depending on which set of inputs has power applied to it, the alarm will produce a different tone.
Gaylord NC-1357A Category : GaylordThis is a rebranded EST/Edwards 270-SPO for use in some sort of ventilator system.
Amseco BZ-54VT+RSD-24L Category : AmsecoThat rubber band is holding the strobe to the unit since there are no screws keeping it secure.