The AW-CSD831 detectors are photo-electronic detector uses a state-of-the-art optical sensing chamber. This detector is a combined detector that uses the heated runner with the best heat transfer sensitivity and the most advanced optical sensing chamber. It is designed to provide open area protection. The red LED on the detector provides a local 360°visible alarm indication. The detector that initiated the alarm condition will have its red LED and relays latched until reset by panel.