# RealtimeServerEventResponseAudioDelta
## Properties
**event_id** | **String** | The unique ID of the server event. |
**r#type** | **String** | The event type, must be `response.output_audio.delta`. |
**response_id** | **String** | The ID of the response. |
**item_id** | **String** | The ID of the item. |
**output_index** | **i32** | The index of the output item in the response. |
**content_index** | **i32** | The index of the content part in the item's content array. |
**delta** | **String** | Base64-encoded audio data delta. |
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