Shop First Alert PROSiX Series Wireless Security Sensors at GeoArm Security. Discover genuine First Alert PROSiX Series encrypted wireless security sensors, including door and window contacts, motion detectors, glass break detectors, smoke and carbon monoxide detectors, environmental sensors, and panic devices designed for residential and commercial security systems. Featuring advanced encrypted wireless technology and seamless compatibility with First Alert alarm control panels, PROSiX sensors deliver reliable intrusion detection, life safety monitoring, and connected property protection. First Alert PROSiX Series wireless security sensors support GeoArm 24/7 professional UL-listed central station monitoring or DIY self-monitoring with no long-term contract.