Wheelock RSSP-121575W

Category : Cerberus Pyrotronics

This is an interesting strobe because it is single gang (half the width of a normal alarm).

Category : Simplex

Unlike the Simplex 4903-9101, this is a light plate rather than a strobe.

Category : Gentex

This alarm uses the same strobe as the SHG/GOS/GXS series of alarms.