Description D-A411 Intelligent Photoelectric Smoke Detector is an addressable fire alarm device cooperating with SHIELD intelligent fire alarm control panels to build a fire detection system. It shows fire alarm by LED indicators and transmits the fire signal to the control panel. Features Twin LED for 360° view. Electronically addressed in field. Built-in microprocessor stores 14 history data. Drift compensation to suit environment changing extensively. Self-diagnostic. Remote indicator output available. Complies with EN 54-7 standard.