diff --git a/src/google/adk/models/gemini_llm_connection.py b/src/google/adk/models/gemini_llm_connection.py
index 3ffdc102..0f1c9670 100644
--- a/src/google/adk/models/gemini_llm_connection.py
+++ b/src/google/adk/models/gemini_llm_connection.py
@@ -106,10 +106,10 @@ class GeminiLlmConnection(BaseLlmConnection):
       input: The input to send to the model.
     """
     if isinstance(input, types.Blob):
-      input_blob = input.model_dump()
       # The blob is binary and is very large. So let's not log it.
       logger.debug('Sending LLM Blob.')
-      await self._gemini_session.send(input=input_blob)
+      await self._gemini_session.send_realtime_input(media=input)
+
     elif isinstance(input, types.ActivityStart):
       logger.debug('Sending LLM activity start signal.')
       await self._gemini_session.send_realtime_input(activity_start=input)
diff --git a/tests/unittests/models/test_gemini_llm_connection.py b/tests/unittests/models/test_gemini_llm_connection.py
index e706a972..6d3e6857 100644
--- a/tests/unittests/models/test_gemini_llm_connection.py
+++ b/tests/unittests/models/test_gemini_llm_connection.py
@@ -45,7 +45,11 @@ async def test_send_realtime_default_behavior(
   await gemini_connection.send_realtime(test_blob)
 
   # Should call send once
-  mock_gemini_session.send.assert_called_once_with(input=test_blob.model_dump())
+  mock_gemini_session.send_realtime_input.assert_called_once_with(
+      media=test_blob
+  )
+  # Should not call .send function
+  mock_gemini_session.send.assert_not_called()
 
 
 @pytest.mark.asyncio