Shop Total Connect Wireless Combo Smoke Heat and Carbon Monoxide Detectors at GeoArm Security. These multi-threat sensors detect airborne smoke particles, dangerous carbon monoxide gas, fixed high temperatures, or rapid temperature increases to provide early warnings of fire or CO exposure. Total Connect-compatible wireless smoke, heat, and carbon monoxide detectors support GeoArm 24/7 professional UL-listed central station monitoring or DIY self-monitoring with no long-term contract.