A virtual machine can emulate only one USB controller, which provides you with the possibility to connect up to eight USB 2.0 and five USB 1.1 devices to the virtual machine.
To edit the device settings, do the following:
Note: If this device is absent, you can add it to Virtual Machine Configuration. For detailed information on how to add a device, refer to Adding and Removing Devices.
In the USB Controller pane, you can see the USB devices currently connected to your virtual machine.
If you want to prevent Virtual Machine Configuration from unauthorized changes, click the Lock icon at the bottom of the window. The next time someone wants to change the settings in any pane of Virtual Machine Configuration, an administrator's password will be required.