IP4943B Features Superb stereo sound effect for music play Ergonomic design for a comfortable fit Built-in microphone for hands free calling Universal 3.5mm plug Convenient 1.2 m cable General Specs Brand & Model awei E511  Sound Stereo sound Earphone Type Earphones Microphone Yes Volume Control N/A Impedance 16 ohms Frequency Response 18Hz-25kHz Sensitivity 96 ± 3dB  Connector 3.5 mm audio jack Cable Length 1.2 m Compatibility iPhone， Samsung， HTC， Sony， Nokia and other cell phones equipped with a 3.5 mm audio interface Package Details Weight: 46.01 g Size: 20*6*2.2 cm