stereo earphones FE1201 mp3 earphone/headphone 1.Frequency Response: 20Hz-20 kHz 2.color:optional,different stereo earphones (Mode No. FE1201)Drive unit:15mm Frequency response:16-20kHZSensitivity:107db±3dbImpedance:16 ohm Rated Power: 50mW Jack:Diameter 3.5mmLength:1.2M stereo earphone ( FE1201)