---
title: kUSBSerialNumberString
framework: IOKit
role: symbol
role_heading: Macro
platforms: [Mac Catalyst 13.0+, macOS 10.6+]
path: iokit/kusbserialnumberstring
---

# kUSBSerialNumberString

## Declaration

```occ
#define kUSBSerialNumberString
```

## Discussion

Discussion IORegistry key for the device's USB serial number string