diff --git a/src/main/java/org/qpython/qsl4a/qsl4a/facade/MediaRecorderFacade.java b/src/main/java/org/qpython/qsl4a/qsl4a/facade/MediaRecorderFacade.java
index 0eab0dc3d3e553f7d055cafa8952b77a9d19698d..d68057d8004e0b6b6052920e98d9ecd0c68ca68b 100644
--- a/src/main/java/org/qpython/qsl4a/qsl4a/facade/MediaRecorderFacade.java
+++ b/src/main/java/org/qpython/qsl4a/qsl4a/facade/MediaRecorderFacade.java
@@ -70,8 +70,8 @@ public class MediaRecorderFacade extends RpcReceiver {
 
   @Rpc(description = "Records audio from the microphone and saves it to the given location.")
   public void recorderStartMicrophone(@RpcParameter(name = "targetPath") String targetPath)
-      throws IOException {
-    startAudioRecording(targetPath, MediaRecorder.AudioSource.MIC);
+      throws Exception {
+    startAudioRecording(targetPath);
   }
 
   @Rpc(description = "Records video from the camera and saves it to the given location. "
@@ -126,7 +126,7 @@ public class MediaRecorderFacade extends RpcReceiver {
       break;
     }
 
-    mMediaRecorder.setAudioSource(audioSource);
+    setAudioSource(audioSource);
     String extension = file.toString().split("\\.")[1];
     if (extension.equals("mp4")) {
       mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
@@ -181,7 +181,7 @@ public class MediaRecorderFacade extends RpcReceiver {
       } catch (Exception e) {
         LogUtil.e(e);
       }
-      mMediaRecorder.setAudioSource(audioSource);
+      setAudioSource(audioSource);
       mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
       mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
     } else {
@@ -200,8 +200,8 @@ public class MediaRecorderFacade extends RpcReceiver {
     prepTask.finish();
   }
 
-  private void startAudioRecording(String targetPath, int source) throws IOException {
-    mMediaRecorder.setAudioSource(source);
+  private void startAudioRecording(String targetPath) throws Exception {
+    setAudioSource();
     mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
     mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
     mMediaRecorder.setOutputFile(targetPath);
@@ -209,6 +209,18 @@ public class MediaRecorderFacade extends RpcReceiver {
     mMediaRecorder.start();
   }
 
+  private void setAudioSource() throws Exception {
+    setAudioSource(MediaRecorder.AudioSource.MIC);
+  }
+
+  private void setAudioSource(int source) throws Exception {
+    try {
+      mMediaRecorder.setAudioSource(source);
+    } catch(Exception e){
+      throw new Exception("Please check Microphone Permission .\n"+e);
+    }
+  }
+
   @Rpc(description = "Stops a previously started recording.")
   public void recorderStop() {
     mMediaRecorder.stop();
diff --git a/src/main/java/org/qpython/qsl4a/qsl4a/facade/SettingsFacade.java b/src/main/java/org/qpython/qsl4a/qsl4a/facade/SettingsFacade.java
index 151490eb301a406530dcb96a0fb2d86d0fba5b9b..2f29d230ef6e7bd18aadd5a581667a10b3c0cfbb 100644
--- a/src/main/java/org/qpython/qsl4a/qsl4a/facade/SettingsFacade.java
+++ b/src/main/java/org/qpython/qsl4a/qsl4a/facade/SettingsFacade.java
@@ -276,15 +276,25 @@ public class SettingsFacade extends RpcReceiver {
   }
 
   @Rpc(description = "get system infomation .")
-  public Map<String,String> getSysInfo(){
-    Map<String,String> s = new HashMap<>();
+  public Map<String,Object> getSysInfo() {
+    Map<String, Object> s = new HashMap<>();
     s.put("model", Build.MODEL);
-    s.put("sdk",Build.VERSION.SDK);
-    s.put("release",Build.VERSION.RELEASE);
-    s.put("brand",Build.BRAND);
-    s.put("device",Build.DEVICE);
-    s.put("display",Build.DISPLAY);
+    s.put("sdk", Build.VERSION.SDK_INT);
+    s.put("release", Build.VERSION.RELEASE);
+    s.put("brand", Build.BRAND);
+    s.put("device", Build.DEVICE);
+    s.put("display", Build.DISPLAY);
+    s.put("manufacturer", Build.MANUFACTURER);
     s.put("language", Locale.getDefault().getLanguage());
+    try {
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
+        s.put("serial", Build.getSerial());
+      else
+        s.put("serial", Build.SERIAL);
+    } catch (Exception ignored){}
+    s.put("hardware", Build.HARDWARE);
+    s.put("user", Build.USER);
+    s.put("abis", Build.SUPPORTED_ABIS);
     return s;
   }
 
diff --git a/src/main/java/org/qpython/qsl4a/qsl4a/facade/TextToSpeechFacade.java b/src/main/java/org/qpython/qsl4a/qsl4a/facade/TextToSpeechFacade.java
index 147b4559ad6b0da1da252f83dc8ec5b3519fae5d..9dc0e39a6b47a7b8486c0fa572a1f1c4061d2f36 100644
--- a/src/main/java/org/qpython/qsl4a/qsl4a/facade/TextToSpeechFacade.java
+++ b/src/main/java/org/qpython/qsl4a/qsl4a/facade/TextToSpeechFacade.java
@@ -20,10 +20,9 @@ import android.os.SystemClock;
 import android.speech.tts.TextToSpeech;
 import android.speech.tts.TextToSpeech.OnInitListener;
 
-
 import org.qpython.qsl4a.qsl4a.jsonrpc.RpcReceiver;
 import org.qpython.qsl4a.qsl4a.rpc.Rpc;
-import org.qpython.qsl4a.qsl4a.rpc.RpcMinSdk;
+import org.qpython.qsl4a.qsl4a.rpc.RpcDefault;
 import org.qpython.qsl4a.qsl4a.rpc.RpcParameter;
 
 import java.util.concurrent.CountDownLatch;
@@ -32,7 +31,6 @@ import java.util.concurrent.CountDownLatch;
  * Provides Text To Speech services for API 4 or more.
  */
 
-@RpcMinSdk(4)
 public class TextToSpeechFacade extends RpcReceiver {
 
   private final TextToSpeech mTts;
@@ -58,10 +56,16 @@ public class TextToSpeechFacade extends RpcReceiver {
   }
 
   @Rpc(description = "Speaks the provided message via TTS.")
-  public void ttsSpeak(@RpcParameter(name = "message") String message) throws InterruptedException {
+  public void ttsSpeak(
+          @RpcParameter(name = "message") String message,
+          @RpcParameter(name = "pitch") @RpcDefault("1.0") Double pitch,
+          @RpcParameter(name = "pitchRate") @RpcDefault("1.0") Double pitchRate
+  ) throws InterruptedException {
     mOnInitLock.await();
     if (message != null) {
-      mTts.speak(message, TextToSpeech.QUEUE_ADD, null);
+      mTts.setSpeechRate(pitchRate.floatValue());
+      mTts.setPitch(pitch.floatValue());
+      mTts.speak(message, TextToSpeech.QUEUE_ADD, null,null);
     }
   }
 
diff --git a/src/main/java/org/qpython/qsl4a/qsl4a/rpc/MethodDescriptor.java b/src/main/java/org/qpython/qsl4a/qsl4a/rpc/MethodDescriptor.java
index 72fb263785c7425c042c8240930034bf0bdc1336..ce99cbcea5c2b0fe544fed6cd170bf052f0d4c1f 100644
--- a/src/main/java/org/qpython/qsl4a/qsl4a/rpc/MethodDescriptor.java
+++ b/src/main/java/org/qpython/qsl4a/qsl4a/rpc/MethodDescriptor.java
@@ -506,6 +506,16 @@ public final class MethodDescriptor {
         throw new IllegalArgumentException("'" + input + "' is not a boolean");
       }
     });
+    converters.put(Double.class, new Converter<Double>() {
+      @Override
+      public Double convert(String input) {
+        try {
+          return Double.parseDouble(input);
+        } catch (NumberFormatException e) {
+          throw new IllegalArgumentException("'" + input + "' is not a float");
+        }
+      }
+    });
     return converters;
   }
 }