It ONLY converts USB 3.0 to VGA, not the other way around.
Make sure your devices have USB3.0 port (USB3.0 supports: 1920x1080 (1080p max), USB2.0 only supports: 800x600)
Driver should be installed for the adapter to function well. If your PC/laptop does not have CD-ROM or the disc is cracked, please download the driver and user manual at
USB 3.0 2.0 Male To HD VGA Female Multi Monitor External Video Card Adapter Black