EP0228R Features Superb stereo sound quality 12mm 4U driver with copper ring Strong high and bass sound quality High qulity microphone ensures clear sound Comfortable to wear Eary to carry General Specs Brand LANGSTON Model JM02 Sound Excellent stereo sound Earphone Type Wired headset Sensitivity 110 db Impedance  19 ohms at 1kHz Frequency Response 13Hz-22500Hz Connector 3.5 mm audio jack Cable Length 1.2 m Compatibility Computer， mobile phone， MP3 player， MP4 player， tablet PC， Nokia N76， N81， N82， N86， N95， 5310， N96， N97， N97 MINI