BYTECH - Metallic Stereo Earbuds w/mic - (Green/Black) Tangle-free cable design Built-in mic w/ call answer/ call end/ mute buttons allows you to seamlessly switch between calls and music 3.5mm connector compatible w/ all mobile phones, music players. portable gaming devices and computers Cable length: 4ft plus/minus 10%, Speaker size: 9mm Frequency response: 20-20,000Hz, Sensitivity: 105dB plus/minus 3dB, Impedance: 320hm