Alarm push button by glass breakage, red color with alarm resistor of 470? for conventional systems. Design for an exclusive use indoor and surface mounting or recessed through standard box. Certified for its used in gas atmosphere in 0,1 and 2 zones. Includes a surface mounting box, protection cover and KG1 glass. For integration in Analogical systemes, requiers a zone module M710-CZR. Requires a galvanic insulator AIS-GALD1 or compatible zener barrier. Also available without resistor and NA/NC contact, ref.: MCP3A-RSG/ISC.