# NewDeviceMetadataType


Information that your user pool responds with in `AuthenticationResult`when you configure it to remember devices and a user signs in with an unrecognized device. Amazon Cognito presents a new device key that you can use to set up [device authentication](https://docs.aws.amazon.com/cognito/latest/developerguide/amazon-cognito-user-pools-device-tracking.html) in a "Remember me on this device" authentication model.

This data type is a response parameter of authentication operations like [InitiateAuth](API_InitiateAuth.md), [AdminInitiateAuth](API_AdminInitiateAuth.md), [RespondToAuthChallenge](API_RespondToAuthChallenge.md), and [AdminRespondToAuthChallenge](API_AdminRespondToAuthChallenge.md).

## Contents


 ** DeviceGroupKey **   <a name="CognitoUserPools-Type-NewDeviceMetadataType-DeviceGroupKey"></a>
The device group key, an identifier used in generating the `DEVICE_PASSWORD_VERIFIER` for device SRP authentication.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 131072.  
Required: No

 ** DeviceKey **   <a name="CognitoUserPools-Type-NewDeviceMetadataType-DeviceKey"></a>
The device key, an identifier used in generating the `DEVICE_PASSWORD_VERIFIER` for device SRP authentication.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 55.  
Pattern: `[\w-]+_[0-9a-f-]+`   
Required: No

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/cognito-idp-2016-04-18/NewDeviceMetadataType) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cognito-idp-2016-04-18/NewDeviceMetadataType) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cognito-idp-2016-04-18/NewDeviceMetadataType)