diff --git a/Deepgram.Microphone/Microphone.cs b/Deepgram.Microphone/Microphone.cs
index bb0da3f7..d1492e7d 100644
--- a/Deepgram.Microphone/Microphone.cs
+++ b/Deepgram.Microphone/Microphone.cs
@@ -11,7 +11,7 @@ namespace Deepgram.Microphone;
 /// </summary>
 public class Microphone
 {
-    private Action<byte[]> _push_callback;
+    private Action<byte[], int> _push_callback;
 
     private int _rate;
     private uint _chunk;
@@ -27,7 +27,7 @@ public class Microphone
     /// Constructor for Microphone
     /// </summary>
     public Microphone(
-        Action<byte[]> push_callback,
+        Action<byte[], int> push_callback,
         int rate = Defaults.RATE,
         uint chunkSize = Defaults.CHUNK_SIZE,
         int channels = Defaults.CHANNELS,
@@ -120,7 +120,7 @@ private StreamCallbackResult _callback(nint input, nint output, uint frameCount,
         }
 
         // Push the data to the callback
-        _push_callback(buf);
+        _push_callback(buf, buf.Length);
 
         return StreamCallbackResult.Continue;
     }
diff --git a/Deepgram/Clients/Interfaces/v1/Constants.cs b/Deepgram/Clients/Interfaces/v1/Constants.cs
new file mode 100644
index 00000000..11b4de71
--- /dev/null
+++ b/Deepgram/Clients/Interfaces/v1/Constants.cs
@@ -0,0 +1,15 @@
+// Copyright 2024 Deepgram .NET SDK contributors. All Rights Reserved.
+// Use of this source code is governed by a MIT license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
+
+namespace Deepgram.Clients.Interfaces.v1;
+
+/// <summary> 
+/// Headers of interest in the return values from the Deepgram Speak API.
+/// </summary> 
+public static class Constants
+{
+    // WS buffer size
+    public const int UseArrayLengthForSend = -1;
+}
+
diff --git a/Deepgram/Clients/Interfaces/v1/IListenWebSocketClient.cs b/Deepgram/Clients/Interfaces/v1/IListenWebSocketClient.cs
index c290b02b..1776aa38 100644
--- a/Deepgram/Clients/Interfaces/v1/IListenWebSocketClient.cs
+++ b/Deepgram/Clients/Interfaces/v1/IListenWebSocketClient.cs
@@ -71,32 +71,47 @@ public Task Connect(LiveSchema options, CancellationTokenSource? cancelToken = n
     #endregion
 
     #region Send Functions
+    /// <summary>
+    /// Sends a KeepAlive message to Deepgram
+    /// </summary>
+    public void SendKeepAlive();
+
+    /// <summary>
+    /// Sends a Finalize message to Deepgram
+    /// </summary>
+    public void SendFinalize();
+
+    /// <summary>
+    /// Sends a Close message to Deepgram
+    /// </summary>
+    public void SendClose(bool nullByte = false);
+
     /// <summary>
     /// Sends a binary message over the WebSocket connection.
     /// </summary>
     /// <param name="data">The data to be sent over the WebSocket.</param>
-    public void Send(byte[] data);
+    public void Send(byte[] data, int length = Constants.UseArrayLengthForSend);
 
     /// <summary>
     /// This method sends a binary message over the WebSocket connection.
     /// </summary>
     /// <param name="data"></param>
-    public void SendBinary(byte[] data);
+    public void SendBinary(byte[] data, int length = Constants.UseArrayLengthForSend);
 
     /// <summary>
     /// This method sends a text message over the WebSocket connection.
     /// </summary>
-    public void SendMessage(byte[] data);
+    public void SendMessage(byte[] data, int length = Constants.UseArrayLengthForSend);
 
     /// <summary>
     /// This method sends a binary message over the WebSocket connection immediately without queueing.
     /// </summary>
-    public void SendBinaryImmediately(byte[] data);
+    public void SendBinaryImmediately(byte[] data, int length = Constants.UseArrayLengthForSend);
 
     /// <summary>
     /// This method sends a text message over the WebSocket connection immediately without queueing.
     /// </summary>
-    public void SendMessageImmediately(byte[] data);
+    public void SendMessageImmediately(byte[] data, int length = Constants.UseArrayLengthForSend);
     #endregion
 
     #region Helpers
diff --git a/Deepgram/Clients/Interfaces/v1/ISpeakWebSocketClient.cs b/Deepgram/Clients/Interfaces/v1/ISpeakWebSocketClient.cs
index 129261e6..3ef24916 100644
--- a/Deepgram/Clients/Interfaces/v1/ISpeakWebSocketClient.cs
+++ b/Deepgram/Clients/Interfaces/v1/ISpeakWebSocketClient.cs
@@ -109,7 +109,7 @@ public Task Connect(SpeakSchema options, CancellationTokenSource? cancelToken =
     /// Sends a binary message over the WebSocket connection.
     /// </summary>
     /// <param name="data">The data to be sent over the WebSocket.</param>
-    public void Send(byte[] data);
+    public void Send(byte[] data, int length = Constants.UseArrayLengthForSend);
 
     ///// <summary>
     ///// This method sends a binary message over the WebSocket connection.
@@ -120,7 +120,7 @@ public Task Connect(SpeakSchema options, CancellationTokenSource? cancelToken =
     /// <summary>
     /// This method sends a text message over the WebSocket connection.
     /// </summary>
-    public void SendMessage(byte[] data);
+    public void SendMessage(byte[] data, int length = Constants.UseArrayLengthForSend);
 
     ///// <summary>
     ///// This method sends a binary message over the WebSocket connection immediately without queueing.
@@ -130,7 +130,7 @@ public Task Connect(SpeakSchema options, CancellationTokenSource? cancelToken =
     /// <summary>
     /// This method sends a text message over the WebSocket connection immediately without queueing.
     /// </summary>
-    public void SendMessageImmediately(byte[] data);
+    public void SendMessageImmediately(byte[] data, int length = Constants.UseArrayLengthForSend);
     #endregion
 
     #region Helpers
diff --git a/Deepgram/Clients/Listen/v1/WebSocket/Client.cs b/Deepgram/Clients/Listen/v1/WebSocket/Client.cs
index dba20455..690894e6 100644
--- a/Deepgram/Clients/Listen/v1/WebSocket/Client.cs
+++ b/Deepgram/Clients/Listen/v1/WebSocket/Client.cs
@@ -314,34 +314,59 @@ public void SendFinalize()
         SendMessageImmediately(data);
     }
 
+    /// <summary>
+    /// Sends a Close message to Deepgram
+    /// </summary>
+    public void SendClose(bool nullByte = false)
+    {
+        Log.Debug("SendFinalize", "Sending Close Message Immediately...");
+        if (nullByte && _clientWebSocket != null)
+        {
+            // send a close to Deepgram
+            lock (_mutexSend)
+            {
+                _clientWebSocket.SendAsync(new ArraySegment<byte>([0]), WebSocketMessageType.Binary, true, _cancellationTokenSource.Token)
+                    .ConfigureAwait(false);
+            }
+            return;
+        }
+
+        byte[] data = Encoding.ASCII.GetBytes("{\"type\": \"CloseStream\"}");
+        SendMessageImmediately(data);
+    }
+
     /// <summary>
     /// Sends a binary message over the WebSocket connection.
     /// </summary>
     /// <param name="data">The data to be sent over the WebSocket.</param>
-    public void Send(byte[] data) => SendBinary(data);
+    public void Send(byte[] data, int length = Constants.UseArrayLengthForSend) => SendBinary(data, length);
 
     /// <summary>
     /// This method sends a binary message over the WebSocket connection.
     /// </summary>
     /// <param name="data"></param>
-    public void SendBinary(byte[] data) =>
-        EnqueueSendMessage(new WebSocketMessage(data, WebSocketMessageType.Binary));
+    public void SendBinary(byte[] data, int length = Constants.UseArrayLengthForSend) =>
+        EnqueueSendMessage(new WebSocketMessage(data, WebSocketMessageType.Binary, length));
 
     /// <summary>
     /// This method sends a text message over the WebSocket connection.
     /// </summary>
-    public void SendMessage(byte[] data) =>
-        EnqueueSendMessage(new WebSocketMessage(data, WebSocketMessageType.Text));
+    public void SendMessage(byte[] data, int length = Constants.UseArrayLengthForSend) =>
+        EnqueueSendMessage(new WebSocketMessage(data, WebSocketMessageType.Text, length));
 
     /// <summary>
     /// This method sends a binary message over the WebSocket connection immediately without queueing.
     /// </summary>
-    public void SendBinaryImmediately(byte[] data)
+    public void SendBinaryImmediately(byte[] data, int length = Constants.UseArrayLengthForSend)
     {
         lock (_mutexSend)
         {
             Log.Verbose("SendBinaryImmediately", "Sending binary message immediately..");  // TODO: dump this message
-            _clientWebSocket.SendAsync(new ArraySegment<byte>(data), WebSocketMessageType.Binary, true, _cancellationTokenSource.Token)
+            if (length == Constants.UseArrayLengthForSend)
+            {
+                length = data.Length;
+            }
+            _clientWebSocket.SendAsync(new ArraySegment<byte>(data, 0, length), WebSocketMessageType.Binary, true, _cancellationTokenSource.Token)
                 .ConfigureAwait(false);
         }
     }
@@ -349,12 +374,16 @@ public void SendBinaryImmediately(byte[] data)
     /// <summary>
     /// This method sends a text message over the WebSocket connection immediately without queueing.
     /// </summary>
-    public void SendMessageImmediately(byte[] data)
+    public void SendMessageImmediately(byte[] data, int length = Constants.UseArrayLengthForSend)
     {
         lock (_mutexSend)
         {
             Log.Verbose("SendBinaryImmediately", "Sending binary message immediately..");  // TODO: dump this message
-            _clientWebSocket.SendAsync(new ArraySegment<byte>(data), WebSocketMessageType.Text, true, _cancellationTokenSource.Token)
+            if (length == Constants.UseArrayLengthForSend)
+            {
+                length = data.Length;
+            }
+            _clientWebSocket.SendAsync(new ArraySegment<byte>(data, 0, length), WebSocketMessageType.Text, true, _cancellationTokenSource.Token)
                 .ConfigureAwait(false);
         }
     }
diff --git a/Deepgram/Clients/Listen/v1/WebSocket/Constants.cs b/Deepgram/Clients/Listen/v1/WebSocket/Constants.cs
index 05f2cdcc..6da861b0 100644
--- a/Deepgram/Clients/Listen/v1/WebSocket/Constants.cs
+++ b/Deepgram/Clients/Listen/v1/WebSocket/Constants.cs
@@ -11,11 +11,13 @@ public static class Constants
 {
     // WS buffer size
     public const int BufferSize = 1024 * 16;
+    public const int UseArrayLengthForSend = -1;
 
     // Default timeout for connect/disconnect
     public const int DefaultConnectTimeout = 5000;
     public const int DefaultDisconnectTimeout = 5000;
 
+    // Default flush period
     public const int DefaultFlushPeriodInMs = 500;
 }
 
diff --git a/Deepgram/Clients/Listen/v1/WebSocket/WebSocketMessage.cs b/Deepgram/Clients/Listen/v1/WebSocket/WebSocketMessage.cs
index b70786f3..5fcd03d1 100644
--- a/Deepgram/Clients/Listen/v1/WebSocket/WebSocketMessage.cs
+++ b/Deepgram/Clients/Listen/v1/WebSocket/WebSocketMessage.cs
@@ -4,9 +4,30 @@
 
 namespace Deepgram.Clients.Listen.v1.WebSocket;
 
-internal readonly struct WebSocketMessage(byte[] message, WebSocketMessageType type)
+internal readonly struct WebSocketMessage
 {
-    public ArraySegment<byte> Message { get; } = new ArraySegment<byte>(message);
+    public WebSocketMessage(byte[] message, WebSocketMessageType type)
+        : this(message, type, Constants.UseArrayLengthForSend)
+    {
+    }
 
-    public WebSocketMessageType MessageType { get; } = type;
+    public WebSocketMessage(byte[] message, WebSocketMessageType type, int length)
+    {
+        if (length != Constants.UseArrayLengthForSend || length < Constants.UseArrayLengthForSend)
+        {
+            Message = new ArraySegment<byte>(message, 0, length);
+        }
+        else
+        {
+            Message = new ArraySegment<byte>(message, 0, message.Length);
+        }
+        MessageType = type;
+        Length = length;
+    }
+
+    public int Length { get; }
+
+    public ArraySegment<byte> Message { get; }
+
+    public WebSocketMessageType MessageType { get; }
 }
diff --git a/Deepgram/Clients/Speak/v1/WebSocket/Client.cs b/Deepgram/Clients/Speak/v1/WebSocket/Client.cs
index 4ba6f6af..8f1ff281 100644
--- a/Deepgram/Clients/Speak/v1/WebSocket/Client.cs
+++ b/Deepgram/Clients/Speak/v1/WebSocket/Client.cs
@@ -348,7 +348,7 @@ public void Close()
     /// Sends a binary message over the WebSocket connection.
     /// </summary>
     /// <param name="data">The data to be sent over the WebSocket.</param>
-    public void Send(byte[] data) => SendMessage(data);
+    public void Send(byte[] data, int length = Constants.UseArrayLengthForSend) => SendMessage(data, length);
 
     ///// <summary>
     ///// This method sends a binary message over the WebSocket connection.
@@ -361,7 +361,7 @@ public void Close()
     /// <summary>
     /// This method sends a text message over the WebSocket connection.
     /// </summary>
-    public void SendMessage(byte[] data)
+    public void SendMessage(byte[] data, int length = Constants.UseArrayLengthForSend)
     {
         // auto flush
         if (_deepgramClientOptions.InspectSpeakMessage())
@@ -384,7 +384,7 @@ public void SendMessage(byte[] data)
         }
 
         // send message
-        EnqueueSendMessage(new WebSocketMessage(data, WebSocketMessageType.Text));
+        EnqueueSendMessage(new WebSocketMessage(data, WebSocketMessageType.Text, length));
     }
     ///// <summary>
     ///// This method sends a binary message over the WebSocket connection immediately without queueing.
@@ -403,7 +403,7 @@ public void SendMessage(byte[] data)
     /// <summary>
     /// This method sends a text message over the WebSocket connection immediately without queueing.
     /// </summary>
-    public void SendMessageImmediately(byte[] data)
+    public void SendMessageImmediately(byte[] data, int length = Constants.UseArrayLengthForSend)
     {
         // auto flush
         if (_deepgramClientOptions.InspectSpeakMessage())
@@ -428,7 +428,11 @@ public void SendMessageImmediately(byte[] data)
         lock (_mutexSend)
         {
             Log.Verbose("SendBinaryImmediately", "Sending text message immediately..");  // TODO: dump this message
-            _clientWebSocket.SendAsync(new ArraySegment<byte>(data), WebSocketMessageType.Text, true, _cancellationTokenSource.Token)
+            if (length == Constants.UseArrayLengthForSend)
+            {
+                length = data.Length;
+            }
+            _clientWebSocket.SendAsync(new ArraySegment<byte>(data, 0, length), WebSocketMessageType.Text, true, _cancellationTokenSource.Token)
                 .ConfigureAwait(false);
         }
     }
diff --git a/Deepgram/Clients/Speak/v1/WebSocket/Constants.cs b/Deepgram/Clients/Speak/v1/WebSocket/Constants.cs
index a65f309e..8f21012a 100644
--- a/Deepgram/Clients/Speak/v1/WebSocket/Constants.cs
+++ b/Deepgram/Clients/Speak/v1/WebSocket/Constants.cs
@@ -11,6 +11,7 @@ public static class Constants
 {
     // WS buffer size
     public const int BufferSize = 1024 * 16;
+    public const int UseArrayLengthForSend = -1;
 
     // Default timeout for connect/disconnect
     public const int DefaultConnectTimeout = 5000;
diff --git a/Deepgram/Clients/Speak/v1/WebSocket/WebSocketMessage.cs b/Deepgram/Clients/Speak/v1/WebSocket/WebSocketMessage.cs
index 51fa8fbe..f9625bb7 100644
--- a/Deepgram/Clients/Speak/v1/WebSocket/WebSocketMessage.cs
+++ b/Deepgram/Clients/Speak/v1/WebSocket/WebSocketMessage.cs
@@ -4,9 +4,30 @@
 
 namespace Deepgram.Clients.Speak.v1.WebSocket;
 
-internal readonly struct WebSocketMessage(byte[] message, WebSocketMessageType type)
+internal readonly struct WebSocketMessage
 {
-    public ArraySegment<byte> Message { get; } = new ArraySegment<byte>(message);
+    public WebSocketMessage(byte[] message, WebSocketMessageType type)
+        : this(message, type, Constants.UseArrayLengthForSend)
+    {
+    }
 
-    public WebSocketMessageType MessageType { get; } = type;
+    public WebSocketMessage(byte[] message, WebSocketMessageType type, int length)
+    {
+        if (length != Constants.UseArrayLengthForSend || length < Constants.UseArrayLengthForSend)
+        {
+            Message = new ArraySegment<byte>(message, 0, length);
+        }
+        else
+        {
+            Message = new ArraySegment<byte>(message, 0, message.Length);
+        }
+        MessageType = type;
+        Length = length;
+    }
+
+    public int Length { get; }
+
+    public ArraySegment<byte> Message { get; }
+
+    public WebSocketMessageType MessageType { get; }
 }