Mosidun MSD-510 Flat In-Ear Earphones w/ Microphone and Volume Control for Samsung / Nokia + More (White) Frenquency range:20Hz-20KHz Impedance:32+-15% Microphone size: 4x1.3mm Cable length:1.35m Sensitivity:109db+3db at 1KHz Maxmum power input:25MW Microphone sensitivity:-58db +-2db