Sonix 010-0100-001 Roots Premium Headphones Bronze Bamboo<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Made with natural grown bamboo. </span></li><li><span class="a-list-item"> High sensitivity (115dB SPL/mW). </span></li><li><span class="a-list-item"> Impedance: 32Ohms. </span></li><li><span class="a-list-item"> Freq. Response: 20Hz to 20，000 Hz. </span></li><li><span class="a-list-item"> Built in mic/button (Patented). </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41uFMmbPrDL.jpg" noproxy>