A4tech Fstyler FH300U Conference USB Over-Ear Headphone

SPECIFICATIONS Speaker Unit: 50 mm Frequency Response: 20 Hz - 20 KHz Sensitivity: 100 dB Impedance: 16 ohm Microphone Frequency Response: 100 Hz-10 KHz Sensitivity : -44 dB Cable Material: Tangle-Free Braided Cable Cable Length: 200 cm Port: USB System Requirement：Windows 7/8/8.1/10，Mac OS X