System Sensor COSMO-2W i4 Series 12/24V 2-Wire System-Connected Combination Carbon Monoxide and Smoke Detector with RealTest Technology combines photoelectric smoke detection and carbon monoxide monitoring in a single 2-wire device, reducing installation complexity while providing comprehensive life safety protection. Featuring RealTest Technology, an integrated 85 dB sounder, and compatibility with the i4 Interface Module, it delivers reliable detection and simplified system integration for residential and commercial applications.

• Combination smoke and carbon monoxide detector reduces wiring requirements and minimizes the number of installed devices
• RealTest Technology enables functional carbon monoxide testing with canned CO gas for easier code-compliant maintenance
• Built-in 85 dB sounder provides distinct Temporal 3 alerts for smoke events and Temporal 4 alerts for carbon monoxide events
• Supports integration of up to 12 compatible detectors through the i4 Interface Module for expanded system coverage
• External IR LED, EZ Walk testing support, and panel status reporting simplify inspection, troubleshooting, and maintenance