This strobe is the same strobe on any of the Simplex rectangular alarms, such as the Simplex 4903-9217. In order to wire and mount it, the strobe has to be popped out of the housing, which can be a pain. These pull stations were rebranded by Simplex in order to be used outdoors. Pulling the pull station requires breaking a. This pull station is just rebranded by Silent Knight. I also have the Simplex and Wheelock versions of this pull.