diff --git a/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java b/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java
index 0d911403..ef3f49a1 100644
--- a/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java
+++ b/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java
@@ -16,7 +16,8 @@ public interface CalculatorLocator {
               @NotNull CalculatorNotifier notifier,
               @NotNull CalculatorHistory history,
               @NotNull CalculatorLogger logger,
-              @NotNull CalculatorPreferenceService preferenceService);
+              @NotNull CalculatorPreferenceService preferenceService,
+              @NotNull CalculatorKeyboard keyboard);
 
     @NotNull
     Calculator getCalculator();
diff --git a/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocatorImpl.java b/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocatorImpl.java
index 68d519ab..e427a45e 100644
--- a/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocatorImpl.java
+++ b/calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocatorImpl.java
@@ -53,7 +53,8 @@ public class CalculatorLocatorImpl implements CalculatorLocator {
                      @NotNull CalculatorNotifier notifier,
                      @NotNull CalculatorHistory history,
                      @NotNull CalculatorLogger logger,
-                     @NotNull CalculatorPreferenceService preferenceService) {
+                     @NotNull CalculatorPreferenceService preferenceService,
+                     @NotNull CalculatorKeyboard keyboard) {
 
         this.calculator = calculator;
         this.calculatorEngine = engine;
@@ -65,7 +66,7 @@ public class CalculatorLocatorImpl implements CalculatorLocator {
 
         calculatorEditor = new CalculatorEditorImpl(this.calculator);
         calculatorDisplay = new CalculatorDisplayImpl(this.calculator);
-        calculatorKeyboard = new CalculatorKeyboardImpl(this.calculator);
+        calculatorKeyboard = keyboard;
     }
 
     @NotNull
diff --git a/calculatorpp-core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java b/calculatorpp-core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java
index 80547dbe..4483804e 100644
--- a/calculatorpp-core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java
+++ b/calculatorpp-core/src/test/java/org/solovyev/android/calculator/AbstractCalculatorTest.java
@@ -11,7 +11,7 @@ import org.solovyev.android.calculator.history.CalculatorHistory;
 public class AbstractCalculatorTest {
 
     protected void setUp() throws Exception {
-        CalculatorLocatorImpl.getInstance().init(new CalculatorImpl(), CalculatorTestUtils.newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class));
+        CalculatorLocatorImpl.getInstance().init(new CalculatorImpl(), CalculatorTestUtils.newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class));
         CalculatorLocatorImpl.getInstance().getEngine().init();
     }
 
diff --git a/calculatorpp-core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java b/calculatorpp-core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
index 01f02041..d024db58 100644
--- a/calculatorpp-core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
+++ b/calculatorpp-core/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
@@ -23,7 +23,7 @@ public class CalculatorTestUtils {
     public static final int TIMEOUT = 3;
 
     public static void staticSetUp() throws Exception {
-        CalculatorLocatorImpl.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class));
+        CalculatorLocatorImpl.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class));
         CalculatorLocatorImpl.getInstance().getEngine().init();
     }
 
diff --git a/calculatorpp/res/layout/function_add_param.xml b/calculatorpp/res/layout/function_add_param.xml
index 9846a28e..8c1232c0 100644
--- a/calculatorpp/res/layout/function_add_param.xml
+++ b/calculatorpp/res/layout/function_add_param.xml
@@ -8,7 +8,13 @@
     <Button
         a:id="@+id/function_add_param_button"
         a:layout_height="wrap_content"
-        a:layout_width="wrap_content"
+        a:layout_width="0dp"
+        a:layout_weight="1"
         a:text="+" />
 
+    <TextView
+        a:layout_height="wrap_content"
+        a:layout_width="0dp"
+        a:layout_weight="5"/>
+
 </LinearLayout>
diff --git a/calculatorpp/res/layout/function_edit_param.xml b/calculatorpp/res/layout/function_edit_param.xml
index 9906f0de..8497312a 100644
--- a/calculatorpp/res/layout/function_edit_param.xml
+++ b/calculatorpp/res/layout/function_edit_param.xml
@@ -8,25 +8,29 @@
     <Button
         a:id="@+id/function_remove_param_button"
         a:layout_height="wrap_content"
-        a:layout_width="wrap_content"
+        a:layout_width="0dp"
+        a:layout_weight="1"
         a:text="-" />
 
-	<Button
-			a:id="@+id/function_up_param_button"
-			a:layout_height="wrap_content"
-			a:layout_width="wrap_content"
-			a:text="↑" />
+    <Button
+        a:id="@+id/function_up_param_button"
+        a:layout_height="wrap_content"
+        a:layout_width="0dp"
+        a:layout_weight="1"
+        a:text="↑" />
 
-	<Button
-			a:id="@+id/function_down_param_button"
-			a:layout_height="wrap_content"
-			a:layout_width="wrap_content"
-			a:text="↓" />
+    <Button
+        a:id="@+id/function_down_param_button"
+        a:layout_height="wrap_content"
+        a:layout_width="0dp"
+        a:layout_weight="1"
+        a:text="↓" />
 
     <org.solovyev.android.calculator.function.FunctionParamEditText
-		a:id="@+id/function_param_edit_text"
-		a:layout_height="wrap_content"
-        a:layout_width="match_parent"
+        a:id="@+id/function_param_edit_text"
+        a:layout_height="wrap_content"
+        a:layout_width="0dp"
+        a:layout_weight="3"
         style="@style/cpp_default_text_size"
         a:inputType="text" />
 
diff --git a/calculatorpp/res/values-ru/text_about.xml b/calculatorpp/res/values-ru/text_about.xml
index fec8cab2..1396202b 100644
--- a/calculatorpp/res/values-ru/text_about.xml
+++ b/calculatorpp/res/values-ru/text_about.xml
@@ -230,5 +230,16 @@
         3. Ручные вычисления (Настройки->Настройки вычислений->Результат вычисляется…)
     </string>
 
+    <string name="c_release_notes_for_107">
+        1. Поддержка пользовательских функций (кнопка +f или кнопка + на экране функций)\n
+        2. Добавлены различные размеры виджета: 3x3, 3x4, 4x4\n
+        3. Добавлено несколько функций: re(x), im(x), √3(x), √4(x), √n(x, n)\n
+        4. Система счисления/единицы измерения углов по умолчанию + окно с ошибками расчётов\n
+        5. Ускорена работа приложения\n
+        6. Исправлена проблема размера шрифта кнопок в мобильной раскладке (для планшетов)\n
+        7. Другие исправления
+    </string>
+
+
 
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/res/values/text_about.xml b/calculatorpp/res/values/text_about.xml
index f28acd0f..d06c00d9 100644
--- a/calculatorpp/res/values/text_about.xml
+++ b/calculatorpp/res/values/text_about.xml
@@ -229,4 +229,14 @@
         3. Manual calculations (Preferences->Calculations Preferences->Result is calculated…)
     </string>
 
+    <string name="c_release_notes_for_107">
+        1. Support for user-defined functions (see +f button or + button inside functions screen)\n
+        2. Widget in different sizes: 3x3, 3x4, 4x4\n
+        3. Several functions added: re(x), im(x), √3(x), √4(x), √n(x, n)\n
+        4. Default number systems/angle units + special warning dialog in case of calculations errors\n
+        5. Performance improvements\n
+        6. Text size in mobile layout for tablets fixed\n
+        7. Bug fixes
+    </string>
+
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorKeyboard.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorKeyboard.java
new file mode 100644
index 00000000..7b3fe6e0
--- /dev/null
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorKeyboard.java
@@ -0,0 +1,86 @@
+package org.solovyev.android.calculator;
+
+import android.app.Activity;
+import android.app.Application;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Vibrator;
+import android.preference.PreferenceManager;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.view.VibratorContainer;
+
+/**
+ * User: serso
+ * Date: 11/18/12
+ * Time: 6:05 PM
+ */
+public class AndroidCalculatorKeyboard implements CalculatorKeyboard {
+
+    @NotNull
+    private final CalculatorKeyboard calculatorKeyboard;
+
+    @NotNull
+    private final Context context;
+
+    private VibratorContainer vibrator;
+
+    public AndroidCalculatorKeyboard(@NotNull Application application,
+                                     @NotNull CalculatorKeyboard calculatorKeyboard) {
+        this.context = application;
+        this.calculatorKeyboard = calculatorKeyboard;
+    }
+
+    @Override
+    public void buttonPressed(@Nullable String text) {
+        vibrate();
+        calculatorKeyboard.buttonPressed(text);
+    }
+
+    private void vibrate() {
+        if (this.vibrator == null) {
+            final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
+            final Vibrator vibrator = (Vibrator) context.getSystemService(Activity.VIBRATOR_SERVICE);
+
+            this.vibrator = new VibratorContainer(vibrator, preferences, 0.5f);
+        }
+
+        this.vibrator.vibrate();
+    }
+
+    @Override
+    public void roundBracketsButtonPressed() {
+        vibrate();
+        calculatorKeyboard.roundBracketsButtonPressed();
+    }
+
+    @Override
+    public void pasteButtonPressed() {
+        vibrate();
+        calculatorKeyboard.pasteButtonPressed();
+    }
+
+    @Override
+    public void clearButtonPressed() {
+        vibrate();
+        calculatorKeyboard.clearButtonPressed();
+    }
+
+    @Override
+    public void copyButtonPressed() {
+        vibrate();
+        calculatorKeyboard.copyButtonPressed();
+    }
+
+    @Override
+    public void moveCursorLeft() {
+        vibrate();
+        calculatorKeyboard.moveCursorLeft();
+    }
+
+    @Override
+    public void moveCursorRight() {
+        vibrate();
+        calculatorKeyboard.moveCursorRight();
+    }
+}
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
index cb6462f8..2d2701cb 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
@@ -91,7 +91,8 @@ public class CalculatorApplication extends android.app.Application {
                 new AndroidCalculatorNotifier(this),
                 new AndroidCalculatorHistory(this, calculator),
                 new AndroidCalculatorLogger(),
-                new AndroidCalculatorPreferenceService(this));
+                new AndroidCalculatorPreferenceService(this),
+                new AndroidCalculatorKeyboard(this, new CalculatorKeyboardImpl(calculator)));
 
         CalculatorLocatorImpl.getInstance().getCalculator().init();
 
diff --git a/calculatorpp/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java b/calculatorpp/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
index 09306825..71229446 100644
--- a/calculatorpp/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
+++ b/calculatorpp/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java
@@ -15,7 +15,7 @@ import org.solovyev.android.calculator.history.CalculatorHistory;
 public class CalculatorTestUtils {
 
     public static void staticSetUp(@Nullable Context context) throws Exception {
-        CalculatorLocatorImpl.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class));
+        CalculatorLocatorImpl.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class));
         CalculatorLocatorImpl.getInstance().getEngine().init();
 
         if ( context != null ) {