Koss QZ-99 Technology Stereo Headphone-Qz/99 Noise Reduction Stereopho

New advances in materials and design have served to expand the performance of stereophones. Koss' Product Development team and engineers look for the most innovative combinations of existing and new technologies to deliver the most exciting products possible. Technical InformationConnectivity TechnologyCable 8 'Sound ModeStereo OutputMono OutputDistortionFrequency Response40Hz to 20kHzImpedance60 OhmEarpieceEarpiece TechnologyDynamicDesign TypeBinaural Ear-cupEarpiece Sensitivity102 dB SPL/1mWControls/IndicatorsEarpiece ControlsVolume Stereo/Mono SwitchInterfaces/PortsInterfaces1 x 3.5 mm Pin Gold Plated6.4 mm Pin Gold PlatedPhysical CharacteristicsShipping Dimensions4.25 Height x 8.5 Width x 9 DepthWeight15 ozShipping Weight1.60 lbMiscellaneousPackage ContentsConnector coupler Additional Information Passive Noise Reduction stereophone system isolates listener from ambient sounds Ideal for use with racing scanners and metal detectors