---
title: kUSBSerialNumberStringIndex
framework: IOKit
role: symbol
role_heading: Macro
platforms: [Mac Catalyst 13.0+, macOS 10.1+]
path: iokit/kusbserialnumberstringindex
---

# kUSBSerialNumberStringIndex

## Declaration

```occ
#define kUSBSerialNumberStringIndex
```

## Discussion

Discussion The field in the USB Device Descriptor corresponding to the index for the serial number's string