XPA-CB-12034 Xpander Optical Smoke Detector (With Mounting Base)Xpander optical detectors are recommended for use as general purpose smoke detectors for early warning of fire in most insatallations Xpander optical detectors operate on the well established light scatter principle. The optical design of the Xpander optical detector allows it to respond to a wide spectrum of fires. The detector is calibrated so that Xpander is highly reliable in detecting fires but has enhanced immunity to false alarms. Features