Product Details  Ear-hook computer headphone.New design and good quality.Wear comfortable and beautiful  The newest design, super lightweight, wear comfortable;  Excellent stereo sound, OEM quality;  30mm NdFeB magnet speaker has enhanced the effect of bass;  With invisible microphone and volume control in line;  With interchangeable earphone housing;  RoHs and customers logo available;  Perfect use for chating on notebook computer;  Earphone Specifications:  Driver Unit: Dia30mm  Impedance: 32ohms  Sensitivity: 104+/-2dB S. P. L. At 1KHz  Frequency Response: 20Hz-20, 000Hz  Max. Input Power: 80mW  Cord Length: Approx. 2m  Plug Type: 3.5mm Stereo  Microphone Specifications:  Dimensions: 6 x 5mm  Directivity: Omnidirectional  Impedance: Low impedance  Sensitivity: -54+/-2dB  Fresponse: 20Hz-20, 000Hz  Rated voltage: 3V Auricular surface can be covered with printed logo