Shop DSC Wired Carbon Monoxide Detectors at GeoArm Security. Browse DSC-Compatible System Sensor hardwired 2-wire smoke and CO detectors and 4-wire carbon monoxide detectors with RealTest technology. These life-safety sensors help protect residential or commercial properties against dangerous carbon monoxide gas and, on combination models, smoke from a potential fire. DSC-Compatible security and fire systems support GeoArm 24/7 professional UL-listed central station monitoring or DIY self-monitoring with no long-term contract.