---
title: restorationID
framework: AudioAccessoryKit
role: symbol
role_heading: Instance Property
platforms: [iOS 27.0+]
path: audioaccessorykit/audioaccessoryheadtracking/session/restorationid
---

# restorationID

A stable identifier the system uses to bring this extension out of suspension when sensor traffic arrives for this accessory.

## Declaration

```swift
final let restorationID: String?
```

## Discussion

Discussion nil if the host could not provide a restoration identifier for the underlying accessory transport.