---
title: IOUSBHostCIDoorbell
framework: IOUSBHost
role: symbol
role_heading: Type Alias
platforms: [Mac Catalyst 14.0+, macOS 10.15+]
path: iousbhost/iousbhostcidoorbell
---

# IOUSBHostCIDoorbell

## Declaration

```swift
typealias IOUSBHostCIDoorbell = UInt32
```

## See Also

### Data Types

- [IOUSBHostCIPortStatus](iousbhost/iousbhostciportstatus.md)
- [IOUSBHostControllerInterfaceCommandHandler](iousbhost/iousbhostcontrollerinterfacecommandhandler.md)
- [IOUSBHostControllerInterfaceDoorbellHandler](iousbhost/iousbhostcontrollerinterfacedoorbellhandler.md)
- [IOUSBHostIsochronousTransactionCompletionHandler](iousbhost/iousbhostisochronoustransactioncompletionhandler.md)