System Sensor HRA - FireAlarms.tv - jjinc24/U8oL0's Fire Alarm Collection

Category : Wheelock

Depending on which set of inputs has power applied to it, the alarm will produce a different tone.

Category : Space Age Electronics

That is an electromechanical horn on the rear of the strobe plate.

Category : Cerberus Pyrotronics, Pyrotronics

This is a rebranded Wheelock horn/strobe, and a pretty rare one at that since it has an electronic horn mechanism...