SENTINEL SM1 System Monitor provides a complete, system wide fault monitoring and reporting solution for mission-critical QFLEX loudspeaker systems, especially in PA/VA and Life Safety applications. Built on a tried and trusted processing engine, the SM1 keeps a watchful eye on the audio system, and if required, any controlling PCs. Issues are reported both via relay contacts to the main monitoring panel in your system, on the front panel display, or through an external audible alarm (not included). Multiple SM1 devices can even monitor each other on the same network simultaneously in systems requiring dual redundancy operation.