In ear headphones series sennheiser cx line type of fitting in ear transmission mode wired features gold plated jacks headset compatible with ios sound function passive noise reduction sensitivity 118 dbmw impedance 18 ohm frequency response 17 21000 hz distortion factor 05 length of cable 12 m types of cable tangle free symmetrical double sided jack 35 mm jack shape l shaped colour red earcup colour black ear pad colour black earp