Class 4 cloaking device
Class 4 cloaking devices were a grade of cloaking device utilized by the Klingons during the 24th century, intended for use on small starships.

The Klingons provided the Maquis with thirty class-4 cloaking devices with the Klingon's understanding that they were to be used on Maquis ships against the Cardassians. ()

Shield technology
Classifications