2- Wire Duct Smoke Detector, 2-Wire, Photoelectric w/ Fixed Thermal Sensor(12/24V), 2WT-B

System Sensor i3  series smoke detectors represent significant advancement in conventional smoke detection. The i3 family is founded on three principles: installation ease and intelligence. Features: * Plug-in detector line, mounting base included * Large wire entry port * In-line terminals with SEMS screws * Mounts to octagonal and single-gang back boxes, * 4-square back boxes, or direct to wall or ceiling * Stop-Drop 'N Lock attachment to base * Removable detector cover and chamber * Built-in remote maintenance signaling * Drift compensation and smoothing algorithms * Simplified sensitivity measurement * Wide-angle, dual-color LED indication * Loop testing via EZ Walk feature * Built-in test switch