USB Headset Steps For Usage 1. Put in the USB port of the headset, Connect to the USB interface of the computer. 2. Playback and recording equipment select all USB PnP sound devices is the default device. 3. Adjust the size of the headdress, Wearing headphones, Put down the microphone, Adjust to the proper position. 4. Use the volume plus and minus keys adjust to You can use it at the right volume. Speaker Parameters: Diameter: 30mm Sensitivity: 110dB Noise Level:-78dBA Dynamic Range: 78 dBA Distortion THD: 0.1% Stereo Crosstalk: -52 dBA Frequency Response: 20Hz - 20KHz> Microphone Parameters: Specification: 9.7 x 6.7mm Sensitivity: -58dB Directionality: Omnidirectional Frequency Response: 50Hz - 15KHz Package List: 1 * 3.5mm Computer Headphones 1 * USB cable