---
title: IOUSBDeviceCapabilityDescriptorHeader
framework: IOKit
role: pseudoSymbol
platforms: []
path: iokit/usb_h_user-space/iousbdevicecapabilitydescriptorheader
---

# IOUSBDeviceCapabilityDescriptorHeader

## Declaration

```occ
struct IOUSBDeviceCapabilityDescriptorHeader {
   UInt8 bLength;
   UInt8 bDescriptorType;
   UInt8 bDevCapabilityType;
   UInt8 bNumDeviceCaps;
};
```

## Overview

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

## See Also

### Related Documentation

- [IOUSBDeviceCapabilityDescriptorHeader](../../kernel/iousbdevicecapabilitydescriptorheader.md)