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Its unidirectional mic and noise-reducing around-ear earcups are ideal for high speed internet use for distance learning applications, tutorials, language learning and situations requiring isolated vocalized feedback. “Project Intercept" Please contact us immediately if you experience any difficulties with your headset. Our “Project Intercept" customer service program will quickly repair or replace items under warranty. Simply contact us via phone or email warranty@califone.com. Visit our website at to learn more about the complete line of Caiifone® audio products including: Wireless public address systems, headphones & headsets, wireless microphone systems, group listening centers, multimedia players and computer peripheral products. We are proud of helping teachers enhance student understanding and achievements since 1947, with your satisfaction as our first priority. This 4100-USB headset carries a one year warranty with service support available through authorized dealers nationwide. Specifications Headphones Frequency Range 30-20,000 Hz Sensitivity 97dB +/-3dB Impedance NA Maximum Power Input 80mW Headband Type Comfort Sling made using ABS plastic for durability Earcup Noise-reducing with ABS plastic for durability Cord connection to earcup Double-reinforced, channel lock strain relief system resists accidental pull out Microphone Frequency Range 70-20,000 Hz Sensitivity -47dB +/-3dB Impedance 2.2KOhms +/-30% (at 1 KHz) Maximum Power Input 200mW USB activated host interface 1.0/1.1 /2.0 (backwards compatible) Type Electret mic Polar Pattern Unidirectional Adjustability Universal joint for full flexibility Operating volt Other Cord Length Typical 5 volt with USB 10 feet Weight 10 ounces, shipping weight 2 lbs. CE rated safe for school use Safety Approval Warranty For school, business, church and gov’t uses for 1 year from purchase date Califone® International Inc. 800-722-0500 2 4100-USB, January 2008...