diff --git a/app/build.gradle b/app/build.gradle
index 6e934da..a0919a0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -33,7 +33,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.material:material:1.2.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
-    testImplementation 'junit:junit:4.+'
+    testImplementation 'junit:junit:4.13.1'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/radio/codec2talkie/Codec2Player.java b/app/src/main/java/com/radio/codec2talkie/Codec2Player.java
new file mode 100644
index 0000000..d8fead0
--- /dev/null
+++ b/app/src/main/java/com/radio/codec2talkie/Codec2Player.java
@@ -0,0 +1,72 @@
+package com.radio.codec2talkie;
+
+import android.bluetooth.BluetoothSocket;
+import android.media.AudioAttributes;
+import android.media.AudioFormat;
+import android.media.AudioRecord;
+import android.media.AudioTrack;
+import android.media.MediaRecorder;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class Codec2Player extends Thread {
+
+    private final InputStream _btInputStream;
+    private final OutputStream _btOutputStream;
+
+    private final int AudioSampleRate = 8000;
+
+    private final AudioRecord _audioRecorder;
+    private final int _audioRecorderMinBufferSize;
+
+    private final AudioTrack _audioPlayer;
+    private final int _audioPlayerMinBufferSize;
+
+    public Codec2Player(BluetoothSocket btSocket) throws IOException {
+
+        _btInputStream = btSocket.getInputStream();
+        _btOutputStream = btSocket.getOutputStream();
+
+        _audioRecorderMinBufferSize = AudioRecord.getMinBufferSize(
+                AudioSampleRate,
+                AudioFormat.CHANNEL_IN_MONO,
+                AudioFormat.ENCODING_PCM_16BIT);
+        _audioRecorder = new AudioRecord(
+                MediaRecorder.AudioSource.MIC,
+                AudioSampleRate,AudioFormat.CHANNEL_IN_MONO,
+                AudioFormat.ENCODING_PCM_16BIT,
+                _audioRecorderMinBufferSize);
+
+        _audioPlayerMinBufferSize = AudioTrack.getMinBufferSize(
+                AudioSampleRate,
+                AudioFormat.CHANNEL_OUT_MONO,
+                AudioFormat.ENCODING_PCM_16BIT);
+        _audioPlayer = new AudioTrack.Builder()
+                .setAudioAttributes(new AudioAttributes.Builder()
+                        .setUsage(AudioAttributes.USAGE_MEDIA)
+                        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+                        .build())
+                .setAudioFormat(new AudioFormat.Builder()
+                        .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
+                        .setSampleRate(AudioSampleRate)
+                        .setChannelMask(AudioFormat.CHANNEL_OUT_MONO)
+                        .build())
+                .setBufferSizeInBytes(_audioPlayerMinBufferSize)
+                .build();
+    }
+
+    @Override
+    public void run() {
+        while (true) {
+            // read from bluetooth, decode and playback
+            try {
+                int countBytes = _btInputStream.available();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+            // read from mic, encode and write to bluetooth
+        }
+    }
+}
diff --git a/app/src/main/java/com/radio/codec2talkie/MainActivity.java b/app/src/main/java/com/radio/codec2talkie/MainActivity.java
index b78d4fe..0df2781 100644
--- a/app/src/main/java/com/radio/codec2talkie/MainActivity.java
+++ b/app/src/main/java/com/radio/codec2talkie/MainActivity.java
@@ -11,12 +11,16 @@ import android.widget.AdapterView;
 import android.widget.Button;
 import android.widget.TextView;
 
+import java.io.IOException;
+
 public class MainActivity extends AppCompatActivity {
 
     private final static int REQUEST_CONNECT_BT = 1;
 
     private TextView _textBtName;
 
+    private Codec2Player _codec2Player;
+
     @SuppressLint("ClickableViewAccessibility")
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -42,6 +46,7 @@ public class MainActivity extends AppCompatActivity {
                     // Start streaming from mic
                     break;
                 case MotionEvent.ACTION_UP:
+                    v.performClick();
                     // Start receiving from bluetooth
                     break;
             }
@@ -57,6 +62,11 @@ public class MainActivity extends AppCompatActivity {
                 finish();
             } else if (resultCode == RESULT_OK) {
                 _textBtName.setText(data.getStringExtra("name"));
+                try {
+                    _codec2Player = new Codec2Player(BluetoothSocketHandler.getSocket());
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
             }
         }
     }
diff --git a/build.gradle b/build.gradle
index 4d24be2..f72c565 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,6 +17,11 @@ allprojects {
         google()
         jcenter()
     }
+    gradle.projectsEvaluated {
+        tasks.withType(JavaCompile) {
+            options.compilerArgs << "-Xlint:deprecation"
+        }
+    }
 }
 
 task clean(type: Delete) {