MT0172B Features In-ear stereo sound earphones designed for iPhone Convenient 1.3 meter cable Equipped with microphone for hands-free calling General Specs Brand & Model BYZ S301 Sound Stereo sound Earphone Type Wired headset Impedance  32 ohms Frequency Response 18-20000Hz Speaker Size 15 mm Sensitivity 116±3dB Cable Length 1.3 m Compatibility iPhone Package Details Weight: 28.89 g Size: 26.3*9.00*1.5 cm Package Includes * BYZ S301 In-ear Stereo Sound Wired Earphones with Microphone for iPhone