MEElectronics M31P-BK In-Ear Headphones with In-Line Microphone/Single Button Remote for iPhone and Smartphones (New Version with Updated Microphone) Black (Discontinued by Manufacturer) Microphone and Remote: Low-profile inline microphone and single button remote 9.0 mm dynamic driver can pump out the bass and retains clarity in the rest of the spectrum Frequency Response: 15Hz-20KHz Sensitivity: 96 dB Impedance: 16 ohms