Cresyn was first launched in 1959 and has been making headphones for over 30 years. Cresyn is the biggest selling headphone brand in South Korea and currently supplies headphones for portable audio and mobile phone manufacturers across the world. Specification (Earphone) Type : Closed, Dynamic Driver Units : Ø8.8 mm Impedance : 26 ? Sensitivity : 90 dB/mW Max. Input Power : 40 mW Frequency Response : 20 ~ 20,000 Hz Cord Length : 1.2 m Plug : 3.5 mm stereo gold-plated plug Specification (Microphone) Type : Omni-directional Output Impedance : 2.2 K? Current consumption : 500? S/N Ratio : 60 dB Sensitivity : -42 dB/mW