---
title: IOUSBDeviceCapabilityDescriptorHeader
framework: IOKit
role: symbol
role_heading: Structure
platforms: [Mac Catalyst 13.0+, macOS 10.7+]
path: iokit/iousbdevicecapabilitydescriptorheader
---

# IOUSBDeviceCapabilityDescriptorHeader

## Declaration

```occ
typedef struct IOUSBDeviceCapabilityDescriptorHeader {
    ...
} IOUSBDeviceCapabilityDescriptorHeader;
```

## Overview

Overview Header for a Device Capability Descriptor for a USB Device. .

## Topics

### Instance Properties

- [bDescriptorType](iokit/iousbdevicecapabilitydescriptorheader/1425640-bdescriptortype.md)
- [bDevCapabilityType](iokit/iousbdevicecapabilitydescriptorheader/1425353-bdevcapabilitytype.md)
- [bLength](iokit/iousbdevicecapabilitydescriptorheader/1425685-blength.md)

## See Also

### Related Documentation

- [IOUSBDeviceCapabilityDescriptorHeader](iokit/usb_h_user-space/iousbdevicecapabilitydescriptorheader.md)