|  | Koss QZ-50 Active Noise Reduction Headset with Behind-The-Neck Style DesignActive Noise Reduction headphone reduces low frequency sounds in noisy environmentsIdeal for airline travel, behind-the-neck design for maximum comfortDynamic element for full sound reproductionFrequency response: 30Hz-20kHzRequires 1 AAA batteryIncludes 4' cord
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