---
title: kIOUSBEndpointDirectionUnknown
framework: usbdriverkit
role: symbol
role_heading: Enumeration Case
path: usbdriverkit/tiousbendpointdirection/kiousbendpointdirectionunknown
---

# kIOUSBEndpointDirectionUnknown

The transfer direction is unknown.

## Declaration

```occ
kIOUSBEndpointDirectionUnknown
```

## See Also

### Getting the Endpoint Direction

- [kIOUSBEndpointDirectionOut](usbdriverkit/tiousbendpointdirection/kiousbendpointdirectionout.md)
- [kIOUSBEndpointDirectionIn](usbdriverkit/tiousbendpointdirection/kiousbendpointdirectionin.md)