Avantone Multi-mode reference headphones with Vari-Vo<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Type Ear coupling: Circumaural Primary application: Recording Secondary application: DJ， live sound Operating principle: Closed back Audio Frequency response (TX): 18Hz - 25kHz Max SPL: 113 dB Driver size 50mm Noise cancelling: No </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41C5fgm52VL.jpg" noproxy>