These sound projectors, characterised by an ABS housing and steel front grille, are fitted with fi reproof cable according to UNI 9795 2010 (length 80 cm). The fi xing system makes mounting easy and enables the speaker unit to be turned in the best direction. These speaker units have been developed specifically for use in emergency and evacuation systems (VES) and each has its own ceramic terminal strip and thermal fuse. These ensure the protection of the line connecting the loudspeakers if a fire puts one or more of the speaker units connected to it out of use.