Sony Mdrzx310ap/w Zx Series Over-ear Headphones With Microphone (white) Driver Unit: 30mm Frequency Response: 10Hz-24KHz Input Impedance: 24 ohms Sensitivity: 98 dB/mW Cord Length: 3.94 ft.Sony Mdrzx310ap/w Zx Series Over-ear Headphones With Microphone (white) available on July 05 2017 from Newegg for itemprop="offers" target="_external" title="" itemscope itemtype="http://schema.org/Offer">49.8