'vendor_id:product_id' (hexadeciaml numbers) or
'spice'
+
-You can use the 'lsusb -t' command to list existing usb devices.
+You can use the 'lsusb -t' command to list existing USB devices.
+
NOTE: This option allows direct access to host hardware. So it is no longer possible to migrate such
machines - use with special care.