A Breen pulse gun was a handheld weapon of Breen origin, in use during the early 24th century. Breen pulse guns were illegal within the United Federation of Planets, because they had only a "kill" setting, and no safety. Asfar Qatala agent Matsaro killed Anisar Batra in 2336 with a Breen pulse gun. (ST - The Lost Era novel: Well of Souls)