Faraday 6180 Category : Faraday The cover of this alarm is made out of something not ordinary, almost like wood.
Amseco BZ-54VT+RSD-24L Category : AmsecoThat rubber band is holding the strobe to the unit since there are no screws keeping it secure.
GE 521BXT Category : GEI think that this smoke detector might be intended for use in security systems.