Contemporary fire alarm systems will often be built-in with other systems or monitored externally. Digital Alarm Communicator Transmitters (DACT) join the fire alarm program to an exterior checking support, typically working with cell phone lines. Two- or four-way circuits hook up initiating products to your fire alarm procedure’s control panel. https://beckettfujxk.nizarblog.com/38121471/fire-alarm-systems-can-be-fun-for-anyone