Koss KTXPRO1 Koss KTXPRO1 Portable Stereophone - Stereo - Mini-phone - Wired - 60 Ohm - 15 Hz 25 kHz - Over-the-head - Binaural - Supra-aural - 4.

: Connectivity Technology: Wired Cable Length: 4 ft Sound Mode: Stereo Impedance: 60 Ohm Minimum Frequency Response: 15 Hz Maximum Frequency Response: 25 k Hz Earpiece Design: Over-the-head Earpiece Type: Binaural Host Interface: Mini-phone Form Factor: Supra-aural.