* EXCELLENT 26dB NOISE REDUCTION RATING * SWITCH SELECTABLE FULL STEREO OR MONO OPERATION * DUAL(DIFFERENTIAL)VOLUME CONTROLS * PRE AMPLIFIER WITH SELECTIVE FILTER * NOISE CANCELING ELECTRET MIC.W/MUFF * MIC BOOM-FLEXIBLE/METAL SWIVEL/METAL HINGED. * TRIPLE-PLATED CHROME HARDWARE * WEIGHT: 14.3 OUNCES * MICROPHONE PLUG : .206 DIAMETER GOLD PLATED * MICROPHONE RANGE : 300-8,000HZ * MICROPHONE SOURCE OHMS : 220-2,200 * SPEAKER PLUG : .250 DIAMETER GOLD PLATED * SPEAKER OHMS : 150 MONO, 300 STEREO * SPEAKER RANGE : 20-17,000HZ * HEAD BAND : AIR CELL * EAR SEAL : SILICON GEL