Koss SportaPro Stereo Headphones<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Headband pivots backward at its base， easily converting from over-the-head style to a behind-the-head style </span></li><li><span class="a-list-item"> Foam ear cushions </span></li><li><span class="a-list-item"> Collapses into a compact， protective package that tucks neatly in a briefcase， gym bag or backpack </span></li><li><span class="a-list-item"> Frequency response: 5Hz-25kHz </span></li><li><span class="a-list-item"> Imp: 60Ω </span></li><li><span class="a-list-item"> 15 to 25，000 Hz frequency response </span></li><li><span class="a-list-item"> Flexible headband design， fully collapsible </span></li></ul><!--   Loading EDP related metadata  --><div aria-live="polite" class="a-row a-expander-container a-expander-inline-container"><div aria-expanded="false" class="a-expander-content a-expander-extend-content" style="display: none;"><ul class="a-unordered-list a-vertical a-spacing-none"><li><span class="a-list-item">Foam ear cushions for open sound</span></li><li><span class="a-list-item">Includes 0.125-inch and 0.25-inch stereo plugs</span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41APh975wFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/417qBV6ycSL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41xB3X%2BmhBL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41WjeEjBJcL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31YLndgyNtL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51yPDAV54aL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51IfOOTMHzL.jpg" noproxy></div></div>