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. Manufacturer: Koss Corporation Manufacturer Part Number: 134122 Manufacturer Website Address: Brand Name: Koss Product Name: QZ-99 Technology Stereo Headphone Product Type: Headphone Connectivity Technology: Wired Cable Length: 96" Sound Mode: Stereo Impedance: 60 Ohm Minimum Frequency Response: 40 Hz Maximum Frequency Response: 20 kHz Plating: Gold Plated Earpiece Technology: Dynamic Earpiece Type: Binaural Host Interface: Phono Form Factor: Ear-cup Weight (Approximate): 15 oz Package Contents: Connector coupler Standard Warranty: Lifetime Limited