The Fire. Lite MS-4 and MS-4E Fire Alarm Control Panels. FIRE ALARM CONTROL PANEL. SEALED NEW IN BOX. (FACPs) bring the latest in microprocessor technology to conventional. The MS-4 is compatible with the i³T. Smoke detectors from System Sensor, with drift compensation. Maintenance alert, and freeze warning. The Notification Appliance Circuit (NAC) protocol. Can silence […]