Shop Honeywell Home Wireless Combo Smoke, Heat, and Carbon Monoxide Detectors at GeoArm Security. Browse 5800-Series (345 MHz) and PROSiX encrypted sensors designed for residential and commercial properties. These life-safety devices detect smoke, abnormal heat conditions, and dangerous carbon monoxide gas, then alert the connected alarm system to a potential threat. Honeywell-Compatible security systems support GeoArm 24/7 professional UL-listed central station monitoring or DIY self-monitoring with no long-term contract.