PRODUCT SUMMARY OF BLAUPUNKT PURE TALK IN EAR EARPHONES 20 ohm Headset Impedance Wired In-ear-canalphone Design 20 Hz - 22000 Hz Headset Frequency Response 100 Hz - 10000 Hz Microphone Frequency Response In-the-ear Headset 10 mm Headset Driver Units Built-in Microphone Click Here for Details