Features 1、Maximumly hold and transport 5 bikes at the same time. 2、Waterproof PVC outer material resists weather damage. 3、Thick foam and fleece inner material protects the truck from being scratched. 4、Adhesive fastener straps easily attach and fix on bike frames. 5、Tailgate handle access flap allows you to easily open and close the tailgate. Specification 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 Adapter Notes: 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. Package List