Features:100% brand new.USB bus-powered mode, no external power required.Digital class-B power amplifier inside.Supports 3D post tonal sound and virtual 5.1 CH sound track.Jack for speaker / headphone / Microphone.Work for Windows 2000 / XP.Compact, portable, convenient to carry.Delivery by random color.The Problem You May Have:Whether there is red light show ?if there is ,please ensure the USB has been installed successfully as show the above picture , if there is no such page show , it means the usb audio device installed fails, please try another computer . If there is no light show ,please change another USB connector to have a look .2. When connected, the sound from the headphones is normal, but the microphone sound is very small:This is caused by the volume of micro in your computer ,please set the micro volume maxium .Package Include:1 x USB Audio Sound Card AdapterNotes:2. When this product is connected to the computer, wait for 5-10 seconds, the computer will jump out USB installation, the following screen will appear at w7 system.Only in this way, it represents the successfully installed, you can use..