This USB 3.0 to VGA adapter is used to connect a USB-enabled laptop/desktop computer to a monitor, projector, TV, to extend workspace with split screen, mirror display, etc. - Important installation: - Insert the adapter into the computer's USB 3.0 interface. Connect this adapter to a second monitor via VGA to VGA cable. - An installation driver will appear in a few minutes when connected to the stable USB port, simply choose the driver and install it. - Follow each step. If a window appears to prevent installation, manually choose "Allow running this software", check "Trust" this software and click the "Install" button. - Wait until prompted to restart the computer and then restart it. - After restarting, the second monitor correctly displays the image. Set the resolution. - Note: - Only works for Windows XP/7/8/8.1/10 operating system. Not compatible with Mac OS/Linux/Vista/Chrome OS/Firestick. - Connect it directly to the rear USB port of your desktop host, instead of the front USB port or through another docking or hubs. - Turn off antivirus software and firewall before installing the driver. Otherwise, it may prevent installation. You can turn them back on after installation. - Remember: once installed correctly, it will prompt you to restart your PC, please restart it, otherwise it will not work. - Make sure the driver is installed properly before using. - This product is not a bidirectional adapter. It only converts USB 3.0 to VGA. - Only USB 3.0 can reach 1080P, it is only 800 x 600 for USB 2.0.