The House of Marley EM-JE013-RT People Get Ready - Jammin' In-Ear Headphone with 3-Button Mic - Roots Frequency response: 20Hz - 20kHz Sensitivity: 103dB @1kHz Nominal Impedance: 16 ohms @ 1kHz Drive Component: 10mm Moving Coil Input Connection: 3.5mm Stereo