---
title: "readAttributeStartUpColorTemperatureMireds(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclustercolorcontrol/readattributestartupcolortemperaturemireds(completionhandler:)"
---

# readAttributeStartUpColorTemperatureMireds(completionHandler:)

## Declaration

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

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