what exactly is the Notifier mmx-1 cmx-2 ?
i don’t understand what it exactly does
Two different items - the MMX-1 is a module that acts as an initiating circuit (such as connecting to a pull station) - the CMX-2 is a module that acts as a relay to switch on or off something (such as connecting to a fan for smoke exhaust or power supply for notification appliances).
Hey thanks for the reply
i saw it on a Ebay listing and was super confused
I learn something new here everyday! 
IF you need them for some reason, the part numbers for modern compatible equivalent parts are
FMM-1
FCM-1