Shop Honeywell Home Wireless Temperature Sensors at GeoArm Security. Browse 5800-Series (345 MHz) and PROSiX encrypted sensors, external temperature probes, and temperature and flood detection kits for residential or commercial properties. These devices monitor high, low, or freezing temperatures and alert the connected alarm system when environmental conditions exceed established limits. Honeywell-Compatible security systems support GeoArm 24/7 professional UL-listed central station monitoring or DIY self-monitoring with no long-term contract.