General Description:
The Headsets, Inc., Model EM-1 headset is designed for maximum comfort in extremely high noise, low frequency environments. The use of advanced electro-acoustical noise reduction circuitry with a patented baffle-plate design provides one of the strongest active noise canceling signals available. The acoustically balanced audio system (ABAS) amplifies the incoming audio signal to deliver a rich, high fidelity audio sound not found in comparable headsets.


General Data
Weight:                        21 oz.                                                    Noise canceling
Operating voltage:      7.5 volts minimum                                          bandwidth:       20 Hz through 800 Hz
                                      10.0 volts maximum
Battery life:                 15 hours on 9 volts


Earphones (audio)
Impedence:                   300 ohm in stereo                             Rated input power:       100 mW nominal
                                       150 ohm in mono                                                                     200 mW maximum

Frequency response (audio)
50 Hz~20 KHz

Microphone

Noise canceling electret cartridge.
Frequency response:   300 Hz~6 KHz                                  Operating voltage:       8v to 16v DC
Impedence:                  1K ohm                                             Current drain:              5 mA