ITC VA-WFM Wall mounted Fireman microphone, Paging to all zones in the system, Support fireman mic recording function, Support self detection in paging conflict status, Can display the EVAC/ALERT audio source status, Same priority for fireman mic & PTT mic, Support power supplied by 24V DC and network cable, Mic input: 24V network port, Sensitivity: 5MV±0.5mV, Frequency response: 200Hz~10kHz, Input impedance: ≥1kΩ.