12-Pack ED1TC Insitutional Headphones for Schools， Libraries and Training Departments<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Packaged Quantity: 12 </span></li><li><span class="a-list-item"> Cable Length: 4 ft </span></li><li><span class="a-list-item"> Frequency Response: 20 kHz - 100 Hz </span></li><li><span class="a-list-item"> Sound Mode: Stereo </span></li><li><span class="a-list-item"> Impedance: 32 Ohm </span></li><li><span class="a-list-item"> Durable design for multiple users， young and old </span></li><li><span class="a-list-item"> Limited Warranty: Lifetime </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41JT6N3QoFL.jpg" noproxy>