Koss COLLAPSABLE FULL SIZE STEREOPHONE
Frequency Response - 4 Hz to 40000 Hz and Impedance - 16 ohms | High fidelity stereophone utilizes an anisotropic magnet and 1.4 mil mylar element for deep bass and treble clarity | Frequency Response: 18-20,000 Hz | Collapsible design for protective storage and maximum portability when listening on the go