The ES-50X FIRE ALARM CONTROL PANEL comes with a pre-installed communicator and supports up to 50 addressable devices in any combination of detectors or modules. The pre-installed IPOTS-COM is a dual technology (POTS and IP) communicator. The POTS transmits system status (alarms, troubles, AC loss, etc.) to a central station, while the IP sends alarm signals over the Internet. The power supply, and all electronics, are contained on a circuit board, supported on a new quick-install chassis and housed in a metal cabinet. And there is selectable strobe synchronization for System Sensor®, Wheelock®, and Gentex® devices and automatic detector sensitivity testing (NFPA 72 compliant). Other features include built-in Class-A capability for all 2 NACs (no optional card required); Remote Acknowledge, Alarm Silence, and Reset and Drill via addressable modules or remote annunciator; and upload/download program and data via USB with optional FSTools Programming Utility. UL listed.