Ultrasone PRO 900 i Stereo Headphones<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> S-Logic Natural Surround Sound Plus </span></li><li><span class="a-list-item"> Dynamic principle， closed </span></li><li><span class="a-list-item"> Frequency range 6-42，000Hz </span></li><li><span class="a-list-item"> Impedance 40 ohm </span></li><li><span class="a-list-item"> New 40 mm Titanium drivers </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51wX1MXwTHL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/516zLm%2Bor2L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41bAkTtnnOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51EoHsbHQ4L.jpg" noproxy>