Detailed Product Description Headphone with MP3 description:1, Headband design,rugged stainless steel bars,adjustable. ... Earphone,Headset,computer headphone,Computer headset,Earplug.2, Direct Factory.3, High quality with competitive price.4, OEM also welcome ... .Specifications:Mi-head size:5*6mmSensitivity: -58dB±3 dBDirectionality:Omni-directionalMi-head impedence:≤2.2KΩSpeaker Diameter:40 ...