PRO-100 Communications Headset (200-0282) Specifications Faxback Doc. # 38974 Frequency: ................................................ 20 - 18,000 Hz Impedance: ................................................ 32 Ohms +/-10% Speaker Diameter: ............................................. 1.5 Inches Volume Control: ............................................ Rotary Switch Ear Cushions: ................................................ Foam Filled (EB 4/16/97)