---
title: "readAttributeRmsVoltageSwell(completion:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterelectricalmeasurement/readattributermsvoltageswell(completion:)"
---

# readAttributeRmsVoltageSwell(completion:)

## Declaration

```swift
func readAttributeRmsVoltageSwell(completion: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)
```

```swift
func readAttributeRmsVoltageSwell() async throws -> NSNumber
```