<b>Specifications: </b> <br> Driver diameter: 40mm <br> Impedance: 32Ohm <br> Sensitivity: 105dB +/- 3dB at 1KHz <br> Frequency range: 15Hz-20KHz <br> Mic dimension: 6.0 * 5.0mm <br> Mic sensitivity: -38dB +/- 3dB <br> Mic impedance: 2.2kohm <br> LED working voltage: DC5V +/- 5% <br> Headset interface: 3.5mm + USB (USB for LED light) <br> Cable length: Approx. 2.2m / 7.22ft <br> Headphone size: Approx. 20 * 9 * 21.5cm / 7.9 * 3.5 * 8.5in <br> Headphone weight: 330g / 11.6oz <br> Package size: 22 * 9.7 * 23.6cm / 8.7 * 3.8 * 9.3in <br> Package weight: 538g / 1.17Lbs <br> <p></p> <p></p> <b>Package content: </b> <br> 1 x EACH G9000 Headphone <br> </p> </p> <b> Notice:</b> </br> <b> The USB is just for LED lights to work, the headphone couldn't work only with the USB, it has to plug the 3.5 mm plug at the same time.</b>