Product FeaturesColor:Blue， Gray， Goldrose ， red<br />Plug diameter: 3.5mm Cable length: about 1.2 meters Sensitivity: 110 + 2dB Impedance: 16? Frequency range: 20Hz-20kHz <br />Maintenance of the headset: 1.use 1/3 of the volume of the driver for 12 hours 2.use 2/3 of the volume of the driver for 12 hours 3.use the normal listening to audio volume driver for 8 hours 4. now you can enjoy your music.