<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.1.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreNFC",
  "identifier" : "/documentation/CoreNFC/NFCFeliCaTag/requestSpecificationVersion(completionHandler:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Core NFC"
    ],
    "preciseIdentifier" : "c:objc(pl)NFCFeliCaTag(im)requestSpecificationVersionWithCompletionHandler:"
  },
  "title" : "requestSpecificationVersion(completionHandler:)"
}
-->

# requestSpecificationVersion(completionHandler:)

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

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

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

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)