Ex-proof Acoustic-optic Annunciator Annunciator;Acoustic-optic Annunciator;explosion-proof acoustic-optic annunciator. Ex-proof Acoustic-optic Annunciator Applications 1.Can be used in Zone 1 and ... ,IIB,IIC,groups explosive atmosphere.*IP65,WF1.Features(Alarm with Acoustic-Optic)Aluminium alloy shell with plastic-sprayed surface.Made of toughened ...