System Sensor 2WTA-B White 2-Wire Photoelectric i3 Series Smoke Detector with Thermal Sensor and Built-In Sounder combines photoelectric smoke sensing, a fixed thermal sensor, and an integrated 85 dB sounder for combined detection and local audible alerting in fire alarm applications. Designed for fast installation and intelligent diagnostics, it improves responsiveness, reduces nuisance alarms, and simplifies maintenance in commercial systems.

• Integrated 85 dB sounder provides local audible alarm in addition to system notification
• Photoelectric smoke detection combined with isolated thermal sensor for multi-criteria fire sensing
• 2-wire plug-in design with included base enables fast installation and simplified pre-wiring
• Drift compensation and signal processing algorithms reduce nuisance alarms and improve stability
• Built-in maintenance and diagnostic signaling supports easier testing and troubleshooting