diff --git a/app/build.gradle b/app/build.gradle
index 8804d22..2213ce0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,8 +10,8 @@ android {
         applicationId "com.github.axet.audiorecorder"
         minSdkVersion 9
         targetSdkVersion 23 // 24+ file:// unable to open
-        versionCode 229
-        versionName "3.0.63"
+        versionCode 230
+        versionName "3.1.0"
     }
     signingConfigs {
         release {
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 89fcfdc..ba7e052 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -9,6 +9,9 @@
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY" />
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
+    <uses-permission android:name="android.permission.BROADCAST_STICKY" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
 
     <application
         android:name=".app.MainApplication"
diff --git a/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java b/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
index d00ef41..c46b0e3 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
@@ -1,7 +1,6 @@
 package com.github.axet.audiorecorder.activities;
 
 import android.Manifest;
-import android.app.AlertDialog;
 import android.app.ProgressDialog;
 import android.content.BroadcastReceiver;
 import android.content.ContentResolver;
@@ -11,6 +10,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.media.AudioFormat;
+import android.media.AudioManager;
 import android.media.AudioRecord;
 import android.media.MediaRecorder;
 import android.net.Uri;
@@ -20,6 +20,7 @@ import android.os.ParcelFileDescriptor;
 import android.os.Process;
 import android.preference.PreferenceManager;
 import android.support.v7.app.ActionBar;
+import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
 import android.telephony.PhoneStateListener;
 import android.telephony.TelephonyManager;
@@ -119,9 +120,29 @@ public class RecordingActivity extends AppCompatActivity {
     }
 
     class RecordingReceiver extends BroadcastReceiver {
+        boolean bluetooth = false;
+        boolean pausedByBluetooth = false;
+
         @Override
         public void onReceive(Context context, Intent intent) {
-            if (intent.getAction().equals(PAUSE_BUTTON)) {
+            String a = intent.getAction();
+            if (a == null)
+                return;
+            if (a.equals(AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED) && bluetooth) {
+                int state = intent.getIntExtra(AudioManager.EXTRA_SCO_AUDIO_STATE, -1);
+                if (AudioManager.SCO_AUDIO_STATE_CONNECTED == state) {
+                    if (pausedByBluetooth) {
+                        pausedByBluetooth = false;
+                        startRecording();
+                    }
+                } else if (AudioManager.SCO_AUDIO_STATE_DISCONNECTED == state) {
+                    if (thread != null) {
+                        pausedByBluetooth = true;
+                        stopRecording(getString(R.string.hold_by_bluetooth));
+                    }
+                }
+            }
+            if (a.equals(PAUSE_BUTTON)) {
                 pauseButton();
             }
         }
@@ -146,7 +167,8 @@ public class RecordingActivity extends AppCompatActivity {
                     break;
                 case TelephonyManager.CALL_STATE_IDLE:
                     if (pausedByCall) {
-                        startRecording();
+                        if (isRecordingReady())
+                            startRecording();
                     }
                     wasRinging = false;
                     pausedByCall = false;
@@ -283,6 +305,7 @@ public class RecordingActivity extends AppCompatActivity {
         receiver = new RecordingReceiver();
         IntentFilter filter = new IntentFilter();
         filter.addAction(PAUSE_BUTTON);
+        filter.addAction(AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED);
         registerReceiver(receiver, filter);
     }
 
@@ -339,10 +362,31 @@ public class RecordingActivity extends AppCompatActivity {
             stopRecording(getString(R.string.recording_status_pause));
         } else {
             editCut();
-            startRecording();
+            if (isRecordingReady())
+                startRecording();
+            else
+                Toast.makeText(this, R.string.hold_by_bluetooth, Toast.LENGTH_SHORT).show();
         }
     }
 
+
+    public boolean isRecordingReady() {
+        final SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(this);
+        if (shared.getString(MainApplication.PREFERENCE_BLUETOOTH, MainApplication.SOURCE_MIC).equals(MainApplication.SOURCE_BLUETOOTH)) {
+            AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+            if (am.isBluetoothScoAvailableOffCall()) {
+                receiver.bluetooth = true;
+                am.stopBluetoothSco(); // stop previous connection (in case of disconnect) seems like bluetooth stack counts
+                am.startBluetoothSco();
+                if (!am.isBluetoothScoOn()) {
+                    receiver.pausedByBluetooth = true;
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
     @Override
     protected void onResume() {
         super.onResume();
@@ -354,7 +398,10 @@ public class RecordingActivity extends AppCompatActivity {
         if (start) {
             start = false;
             if (Storage.permitted(this, PERMISSIONS, RESULT_START)) { // audio perm
-                startRecording();
+                if (isRecordingReady())
+                    startRecording();
+                else
+                    stopRecording(getString(R.string.hold_by_bluetooth));
             }
         }
 
@@ -414,6 +461,11 @@ public class RecordingActivity extends AppCompatActivity {
         }
         pitch.stop();
         sound.unsilent();
+        AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+        if (receiver.bluetooth) {
+            am.stopBluetoothSco();
+            receiver.bluetooth = false;
+        }
     }
 
     void edit(boolean show, boolean animate) {
@@ -863,7 +915,8 @@ public class RecordingActivity extends AppCompatActivity {
         switch (requestCode) {
             case RESULT_START:
                 if (Storage.permitted(this, permissions)) {
-                    startRecording();
+                    if (isRecordingReady())
+                        startRecording();
                 } else {
                     Toast.makeText(this, R.string.not_permitted, Toast.LENGTH_SHORT).show();
                     finish();
@@ -880,13 +933,20 @@ public class RecordingActivity extends AppCompatActivity {
     void encoding(final Runnable done) {
         final File in = storage.getTempRecording();
 
-        if (!in.exists() || in.length() == 0) {
-            final SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(RecordingActivity.this);
-            SharedPreferences.Editor edit = shared.edit();
-            edit.putString(MainApplication.PREFERENCE_LAST, Storage.getDocumentName(targetUri));
-            edit.commit();
+        final Runnable last = new Runnable() {
+            @Override
+            public void run() {
+                final SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(RecordingActivity.this);
+                SharedPreferences.Editor edit = shared.edit();
+                edit.putString(MainApplication.PREFERENCE_LAST, Storage.getDocumentName(targetUri));
+                edit.commit();
 
-            done.run();
+                done.run();
+            }
+        };
+
+        if (!in.exists() || in.length() == 0) {
+            last.run();
             return;
         }
 
@@ -915,12 +975,7 @@ public class RecordingActivity extends AppCompatActivity {
             public void run() { // success
                 Storage.delete(in); // delete raw recording
 
-                final SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(RecordingActivity.this);
-                SharedPreferences.Editor edit = shared.edit();
-                edit.putString(MainApplication.PREFERENCE_LAST, Storage.getDocumentName(targetUri));
-                edit.commit();
-
-                done.run();
+                last.run();
 
                 d.cancel();
             }
@@ -935,16 +990,16 @@ public class RecordingActivity extends AppCompatActivity {
     }
 
     void Post(final Throwable e) {
+        Log.d(TAG, "error", e);
         handler.post(new Runnable() {
             @Override
             public void run() {
-                Error(e);
+                Error(toMessage(e));
             }
         });
     }
 
-    void Error(Throwable e) {
-        Log.d(TAG, "error", e);
+    public String toMessage(Throwable e) {
         String msg = e.getMessage();
         if (msg == null || msg.isEmpty()) {
             Throwable t;
@@ -957,9 +1012,16 @@ public class RecordingActivity extends AppCompatActivity {
             }
             while (t.getCause() != null)
                 t = t.getCause();
-            msg = t.getClass().getSimpleName();
+            msg = t.getMessage();
+            if (msg == null || msg.isEmpty())
+                msg = t.getClass().getSimpleName();
         }
-        Error(msg);
+        return msg;
+    }
+
+    void Error(Throwable e) {
+        Log.d(TAG, "error", e);
+        Error(toMessage(e));
     }
 
     void Error(String msg) {
diff --git a/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java b/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java
index 1907630..499fe27 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java
@@ -7,6 +7,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
+import android.media.AudioManager;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
@@ -258,6 +259,13 @@ public class SettingsActivity extends AppCompatActivity implements SharedPrefere
             s.setPermissionsDialog(this, Storage.PERMISSIONS_RW, RESULT_STORAGE);
             if (Build.VERSION.SDK_INT >= 21)
                 s.setStorageAccessFramework(this, RESULT_STORAGE);
+
+            AudioManager am = (AudioManager) context.getSystemService(AUDIO_SERVICE);
+            Preference bluetooth = pm.findPreference(MainApplication.PREFERENCE_BLUETOOTH);
+            if (!am.isBluetoothScoAvailableOffCall()) {
+                bluetooth.setVisible(false);
+            }
+            bindPreferenceSummaryToValue(bluetooth);
         }
 
         @Override
diff --git a/app/src/main/java/com/github/axet/audiorecorder/app/MainApplication.java b/app/src/main/java/com/github/axet/audiorecorder/app/MainApplication.java
index 1ab3b50..631ce33 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/app/MainApplication.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/app/MainApplication.java
@@ -10,6 +10,11 @@ public class MainApplication extends com.github.axet.audiolibrary.app.MainApplic
     public static final String PREFERENCE_TARGET = "target";
     public static final String PREFERENCE_FLY = "fly";
 
+    public static final String PREFERENCE_BLUETOOTH = "bluetooth";
+
+    public static final String SOURCE_BLUETOOTH = "bluetooth";
+    public static final String SOURCE_MIC = "mic";
+
     public int getUserTheme() {
         return getTheme(this, R.style.RecThemeLight, R.style.RecThemeDark);
     }
diff --git a/app/src/main/java/com/github/axet/audiorecorder/services/RecordingService.java b/app/src/main/java/com/github/axet/audiorecorder/services/RecordingService.java
index ca6fd78..4db4bf8 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/services/RecordingService.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/services/RecordingService.java
@@ -251,4 +251,3 @@ public class RecordingService extends Service {
         Log.d(TAG, "onTaskRemoved");
     }
 }
-
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index ae429bf..6127e8d 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -11,6 +11,11 @@
         <item>8 kHz (Telefon)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>Theme Weiß (Standard)</item>
         <item>Theme Dunkel</item>
@@ -58,4 +63,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Encoding on fly disable editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index c511770..0d92296 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -11,6 +11,11 @@
         <item>8 kHz (téléphone)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>Thème Clair</item>
         <item>Thème Sombre</item>
@@ -58,4 +63,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Encoding on fly disable editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index d72cb8a..f5ac8ff 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -11,6 +11,11 @@
         <item>8 kHz (telefono)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>Tema Bianco (prefedinito)</item>
         <item>Tema Scuro</item>
@@ -58,4 +63,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Encoding on fly disable editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index d6a1375..46bc435 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -11,6 +11,11 @@
         <item>8 kHz (電話)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>テーマ ホワイト (デフォルト)</item>
         <item>テーマ ダーク</item>
@@ -58,4 +63,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Encoding on fly disable editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/values-pt-rBR/strings.xml b/app/src/main/res/values-pt-rBR/strings.xml
index 4d36f37..1749a0e 100644
--- a/app/src/main/res/values-pt-rBR/strings.xml
+++ b/app/src/main/res/values-pt-rBR/strings.xml
@@ -11,6 +11,11 @@
         <item>8 kHz (ligação de tel.)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>Claro (padrão)</item>
         <item>Escuro</item>
@@ -58,4 +63,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Encoding on fly disable editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index bb4b60e..575cba8 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -16,6 +16,11 @@
         <item>8 kHz (телефон)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Микрофон</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="channels_text">
         <item>Моно (по умолчанию)</item>
         <item>Стерео</item>
@@ -23,6 +28,7 @@
 
     <string name="no_folder_app">Программа для просмотра папок не установлена</string>
     <string name="hold_by_call">пауза (звонок)</string>
+    <string name="hold_by_bluetooth">пауза (bluetooth отключен)</string>
     <string name="recording_status_recording">запись</string>
     <string name="recording_status_encoding">кодировка</string>
     <string name="recording_status_pause">пауза</string>
@@ -58,4 +64,5 @@
     <string name="pref_recordings">Записи</string>
     <string name="pref_fly_title">Кодирование на лету</string>
     <string name="pref_fly_summary">Кодирование на лету отключает редактирование и восстановление в случае ошибок</string>
+    <string name="pref_source_title">Источник</string>
 </resources>
diff --git a/app/src/main/res/values-sk/strings.xml b/app/src/main/res/values-sk/strings.xml
index 8e5d5ae..194e291 100644
--- a/app/src/main/res/values-sk/strings.xml
+++ b/app/src/main/res/values-sk/strings.xml
@@ -11,6 +11,11 @@
         <item>8 kHz (telefón)</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>Theme Svetlá (predvolené)</item>
         <item>Theme Tmavá</item>
@@ -58,4 +63,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Encoding on fly disable editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9b8773a..97e57af 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -21,6 +21,16 @@
         <item>8000</item>
     </string-array>
 
+    <string-array name="source_text">
+        <item>Mic</item>
+        <item>Bluetooth</item>
+    </string-array>
+
+    <string-array name="source_values" translatable="false">
+        <item>mic</item>
+        <item>bluetooth</item>
+    </string-array>
+
     <string-array name="themes_text">
         <item>Theme White (default)</item>
         <item>Theme Dark</item>
@@ -90,4 +100,6 @@
     <string name="pref_recordings">Recordings</string>
     <string name="pref_fly_title">Encoding on Fly</string>
     <string name="pref_fly_summary">Enabling encoding on fly disables editing, and crash recovery</string>
+    <string name="pref_source_title">Source</string>
+    <string name="hold_by_bluetooth">pause (bluetooth disconnected)</string>
 </resources>
diff --git a/app/src/main/res/xml/pref_general.xml b/app/src/main/res/xml/pref_general.xml
index 9df6d94..33a381b 100644
--- a/app/src/main/res/xml/pref_general.xml
+++ b/app/src/main/res/xml/pref_general.xml
@@ -7,6 +7,16 @@
             android:summary="/sdcard/some/"
             android:title="@string/pref_storage_title" />
 
+        <ListPreference
+            android:defaultValue="mic"
+            android:entries="@array/source_text"
+            android:entryValues="@array/source_values"
+            android:key="bluetooth"
+            android:negativeButtonText="@null"
+            android:positiveButtonText="@null"
+            android:summary=""
+            android:title="@string/pref_source_title" />
+
         <ListPreference
             android:defaultValue="16000"
             android:entries="@array/sample_rate_text"
@@ -46,15 +56,15 @@
             android:positiveButtonText="@null"
             android:summary="2015-12-31 22:11:34"
             android:title="@string/pref_nameformat_title" />
+    </PreferenceCategory>
 
+    <PreferenceCategory android:title="@string/pref_application">
         <SwitchPreferenceCompat
             android:defaultValue="false"
             android:key="fly"
             android:summary="@string/pref_fly_summary"
             android:title="@string/pref_fly_title" />
-    </PreferenceCategory>
 
-    <PreferenceCategory android:title="@string/pref_application">
         <SwitchPreferenceCompat
             android:defaultValue="true"
             android:key="call"