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# VZUSBController

A class that represents a USB controller in a VM.

```
class VZUSBController
```

## Overview

Don’t create a `VZUSBController` directly. You need to first configure USB controllers on a [`VZVirtualMachineConfiguration`](/documentation/Virtualization/VZVirtualMachineConfiguration) through a subclass of [`VZUSBControllerConfiguration`](/documentation/Virtualization/VZUSBControllerConfiguration). When you create a [`VZVirtualMachine`](/documentation/Virtualization/VZVirtualMachine) from the configuration, the USB controllers are available through the [`usbControllers`](/documentation/Virtualization/VZVirtualMachine/usbControllers) property.

The concrete type of a `VZUSBController` corresponds to the type the configuration uses. For example, a [`VZXHCIControllerConfiguration`](/documentation/Virtualization/VZXHCIControllerConfiguration) leads to a device of type [`VZXHCIController`](/documentation/Virtualization/VZXHCIController).

## Topics

### Instance properties

[`usbDevices`](/documentation/Virtualization/VZUSBController/usbDevices)

The list of attached USB devices for the controller.

### Attaching and detaching devices

[`attach(device:completionHandler:)`](/documentation/Virtualization/VZUSBController/attach(device:completionHandler:))

Attaches a USB device to the controller.

[`detach(device:completionHandler:)`](/documentation/Virtualization/VZUSBController/detach(device:completionHandler:))

Detaches a USB device from the controller.


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