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

# readAttributeAverageRmsVoltageMeasurementPeriod(completion:)

## Declaration

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

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