Sony MDRPQ2/Z PIIQ Headphones (Discontinued by Manufacturer)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Ear Cups : Closed， Dynamic (supra-aural) </span></li><li><span class="a-list-item"> Design : Over-the-head </span></li><li><span class="a-list-item"> Sensitivity : 104 dB/mW </span></li><li><span class="a-list-item"> Frequency Response : 8 - 25，000 Hz </span></li><li><span class="a-list-item"> Impedance : 70 ohms at 1 kHz </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Q4tCB5T6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41nZJn12X0L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51d9Rb-5QjL.jpg" noproxy>