Shop System Sensor Wired Interface Modules at GeoArm Security. Browse hardwired two-wire, four-wire, smoke, carbon monoxide, relay, polarity-reversal, synchronization, and detector-integration modules designed to connect compatible life-safety devices with fire alarm control panels. System Sensor-compatible wired interface modules support GeoArm 24/7 professional UL-listed central station fire alarm monitoring with no long-term contract.