---
title: "requestSpecificationVersion(completionHandler:)"
framework: corenfc
role: symbol
role_heading: Instance Method
path: "corenfc/nfcfelicatag/requestspecificationversion(completionhandler:)"
---

# requestSpecificationVersion(completionHandler:)

Sends the Request Specification Version command, as defined by the FeliCa card specification, to the tag.

## Declaration

```swift
func requestSpecificationVersion(completionHandler: @escaping @Sendable (Int, Int, Data, Data, (any Error)?) -> Void)
```

```swift
func requestSpecificationVersion() async throws -> (Int, Int, Data, Data)
```