<!-- Code generated from the comments of the HWConfig struct in builder/virtualbox/common/hw_config.go; DO NOT EDIT MANUALLY -->

- `cpus` (int) - The number of cpus to use for building the VM.
  Defaults to 1.

- `memory` (int) - The amount of memory to use for building the VM
  in megabytes. Defaults to 512 megabytes.

- `sound` (string) - Defaults to none. The type of audio device to use for
  sound when building the VM. Some of the options that are available are
  dsound, oss, alsa, pulse, coreaudio, null.

- `usb` (bool) - Specifies whether or not to enable the USB bus when
  building the VM. Defaults to false.
