the product is use as the communications terminal 1 multi-purpose 2 noise immunity 3 wear conveniently

Microphone
Alternating current  impedance	150(1±15%)Ω(1kHz)
Sensitivity	≥0.5mv/pa(1KHz)
Frequency Response Range	200Hz-4000Hz
Receiver
Alternating current  impedance	2x300 (1±15%)  ohms   ( 1kHz)
Sensitivity	110db±3db  (test with ear muff  1kHz)
Frequency Response Range	300Hz-3400Hz

Model number :OSD-8

 use:It is mainly used as the communications terminal in the occation of airport ,cabin ,sound lab etc.

Military Aviation noise canceling Headsets OSD-8