4E-FM is a desktop or wall mounted emergency microphone station with high priority and fault surveillance. It can address any zone or set of zones in the entire system, including all call, for highest priority voice emergency. 4E-FM includes handheld microphone and monitored PTT TALK button. 4E-FM is connected to L-Net interface of COMPACT or IMPACT main unit and may be daisy-chained with more L-Net devices. 4E-FM is dedicated only for emergency purpose and can be used by fire brigades, rescue teams and authorized security personnel. As an emergency microphone compliant with EN54-16, 4E-FM features built-in surveillance of the microphone transducer, PTT button and network link monitoring. It also offers redundant L-Net connection for installations with special security requirements.