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

# IOUSBBOSDescriptor

## Declaration

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

## Overview

Overview BOS Descriptor for a USB Device. .

## Topics

### Instance Properties

- [bDescriptorType](iokit/iousbbosdescriptor/1426075-bdescriptortype.md)
- [bLength](iokit/iousbbosdescriptor/1425715-blength.md)
- [bNumDeviceCaps](iokit/iousbbosdescriptor/1425552-bnumdevicecaps.md)
- [wTotalLength](iokit/iousbbosdescriptor/1425679-wtotallength.md)

## See Also

### Related Documentation

- [IOUSBBOSDescriptor](iokit/usb_h_user-space/iousbbosdescriptor.md)