Shop Honeywell Home Wireless Carbon Monoxide Detectors at GeoArm Security. Browse 5800-Series (345 MHz) and PROSiX encrypted sensors designed to detect dangerous carbon monoxide gas in residential and commercial properties. These life-safety devices alert the connected alarm system when elevated carbon monoxide levels are detected, helping protect occupants from this colorless and odorless threat. Honeywell-Compatible security systems support GeoArm 24/7 professional UL-listed central station monitoring or DIY self-monitoring with no long-term contract.