---
title: "readAttributeSerialNumber(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterbasic/readattributeserialnumber(completionhandler:)"
---

# readAttributeSerialNumber(completionHandler:)

## Declaration

```swift
func readAttributeSerialNumber(completionHandler: @escaping @Sendable (String?, (any Error)?) -> Void)
```

```swift
func readAttributeSerialNumber() async throws -> String
```