---
title: kIOUSBDescriptorSizeUSB20ExtensionCapability
framework: usbdriverkit
role: symbol
role_heading: Enumeration Case
path: usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizeusb20extensioncapability
---

# kIOUSBDescriptorSizeUSB20ExtensionCapability

The size of a USB 2.0 extension capability descriptor.

## Declaration

```occ
kIOUSBDescriptorSizeUSB20ExtensionCapability
```

## See Also

### Getting the Descriptor Size

- [kIOUSBDescriptorHeaderSize](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorheadersize.md)
- [kIOUSBDescriptorSizeDevice](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizedevice.md)
- [kIOUSBDescriptorSizeConfiguration](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizeconfiguration.md)
- [kIOUSBDescriptorSizeInterface](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizeinterface.md)
- [kIOUSBDescriptorSizeEndpoint](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizeendpoint.md)
- [kIOUSBDescriptorSizeStringMinimum](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizestringminimum.md)
- [kIOUSBDescriptorSizeStringMaximum](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizestringmaximum.md)
- [kIOUSBDescriptorSizeDeviceQualifier](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizedevicequalifier.md)
- [kIOUSBDescriptorSizeInterfaceAssociation](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizeinterfaceassociation.md)
- [kIOUSBDescriptorSizeBOS](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizebos.md)
- [kIOUSBDescriptorSizeDeviceCapability](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizedevicecapability.md)
- [kIOUSBDescriptorSizeSuperSpeedUSBDeviceCapability](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizesuperspeedusbdevicecapability.md)
- [kIOUSBDescriptorSizeContainerIDCapability](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizecontaineridcapability.md)
- [kIOUSBDescriptorSizeHubMinimum](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizehubminimum.md)
- [kIOUSBDescriptorSizeHubMaximum](usbdriverkit/tiousbdescriptorsize/kiousbdescriptorsizehubmaximum.md)