Plug-in detector cable and included mounting base Ample wire entrance port In-line terminals that use SEMS screws Mounts to single-gang and octagonal backboxes, 4-square backboxes, or straight to the ceiling Stop-Drop "N Lock attachment to base of device Detector cover and chamber can be removed for easy cleaning Integrated remote maintenance signaling Drift adjustment and smoothing algorithms Sensitivity measurement features ease of use Wide angle, bi-color LED display Loop testing with EZ Walk function Pre-installed test switch.