---
title: sspCompanionDescriptor
framework: iousbhost
role: symbol
role_heading: Instance Property
path: iousbhost/iousbhostiosourcedescriptors/sspcompaniondescriptor
---

# sspCompanionDescriptor

The descriptor for a SuperSpeedPlus isochronous USB endpoint companion.

## Declaration

```swift
var sspCompanionDescriptor: IOUSBSuperSpeedPlusIsochronousEndpointCompanionDescriptor
```

## Discussion

Discussion This descriptor may be necessary for bcdUSB versions 0x0300 and greater, depending on device operating speed and values set in the descriptors. See USB 3.2, 9.5 for more information.

## See Also

### Descriptors

- [bcdUSB](iousbhost/iousbhostiosourcedescriptors/bcdusb.md)
- [descriptor](iousbhost/iousbhostiosourcedescriptors/descriptor.md)
- [ssCompanionDescriptor](iousbhost/iousbhostiosourcedescriptors/sscompaniondescriptor.md)