diff --git a/src/main/java/org/billthefarmer/siggen/Main.java b/src/main/java/org/billthefarmer/siggen/Main.java
index c42fac6..3a49b32 100644
--- a/src/main/java/org/billthefarmer/siggen/Main.java
+++ b/src/main/java/org/billthefarmer/siggen/Main.java
@@ -32,6 +32,9 @@
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
+import android.graphics.drawable.Drawable;
 import android.media.AudioFormat;
 import android.media.AudioManager;
 import android.media.AudioTrack;
@@ -118,6 +121,11 @@ public class Main extends Activity
     private Scale scale;
     private Display display;
 
+    private Drawable check_on;
+    private Drawable check_off;
+    private Drawable radio_on;
+    private Drawable radio_off;
+
     private SeekBar duty;
     private SeekBar fine;
     private SeekBar level;
@@ -183,6 +191,15 @@ protected void onCreate(Bundle savedInstanceState)
         fine = findViewById(R.id.fine);
         level = findViewById(R.id.level);
 
+        Resources.Theme current = getTheme();
+        TypedArray array =
+            current.obtainStyledAttributes(R.styleable.Siggen);
+        check_on = array.getDrawable(R.styleable.Siggen_check_on);
+        check_off = array.getDrawable(R.styleable.Siggen_check_off);
+        radio_on = array.getDrawable(R.styleable.Siggen_radio_on);
+        radio_off = array.getDrawable(R.styleable.Siggen_radio_off);
+        array.recycle();
+
         // Get wake lock
         PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
         wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, LOCK);
@@ -759,14 +776,14 @@ public void onClick(View v)
             if (audio != null)
                 audio.waveform = Audio.SINE;
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_on_background, 0, 0, 0);
+                radio_on, null, null, null);
 
             v = findViewById(R.id.square);
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_off_background, 0, 0, 0);
+                radio_off, null, null, null);
             v = findViewById(R.id.sawtooth);
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_off_background, 0, 0, 0);
+                radio_off, null, null, null);
             break;
 
         // Square
@@ -774,14 +791,14 @@ public void onClick(View v)
             if (audio != null)
                 audio.waveform = Audio.SQUARE;
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_on_background, 0, 0, 0);
+                radio_on, null, null, null);
 
             v = findViewById(R.id.sine);
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_off_background, 0, 0, 0);
+                radio_off, null, null, null);
             v = findViewById(R.id.sawtooth);
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_off_background, 0, 0, 0);
+                radio_off, null, null, null);
             break;
 
         // Sawtooth
@@ -789,14 +806,14 @@ public void onClick(View v)
             if (audio != null)
                 audio.waveform = Audio.SAWTOOTH;
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_on_background, 0, 0, 0);
+                radio_on, null, null, null);
 
             v = findViewById(R.id.sine);
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_off_background, 0, 0, 0);
+                radio_off, null, null, null);
             v = findViewById(R.id.square);
             ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                android.R.drawable.radiobutton_off_background, 0, 0, 0);
+                radio_off, null, null, null);
             break;
 
         // Mute
@@ -806,11 +823,11 @@ public void onClick(View v)
 
             if (audio.mute)
                 ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                    android.R.drawable.checkbox_on_background, 0, 0, 0);
+                    check_on, null, null, null);
 
             else
                 ((Button) v).setCompoundDrawablesWithIntrinsicBounds(
-                    android.R.drawable.checkbox_off_background, 0, 0, 0);
+                    check_off, null, null, null);
             break;
 
         // Back
diff --git a/src/main/res/drawable/ic_check_box_black_24dp.xml b/src/main/res/drawable/ic_check_box_black_24dp.xml
new file mode 100644
index 0000000..9948171
--- /dev/null
+++ b/src/main/res/drawable/ic_check_box_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19,3L5,3c-1.11,0 -2,0.9 -2,2v14c0,1.1 0.89,2 2,2h14c1.11,0 2,-0.9 2,-2L21,5c0,-1.1 -0.89,-2 -2,-2zM10,17l-5,-5 1.41,-1.41L10,14.17l7.59,-7.59L19,8l-9,9z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_check_box_outline_blank_black_24dp.xml b/src/main/res/drawable/ic_check_box_outline_blank_black_24dp.xml
new file mode 100644
index 0000000..cf8bfa2
--- /dev/null
+++ b/src/main/res/drawable/ic_check_box_outline_blank_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19,5v14H5V5h14m0,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2V5c0,-1.1 -0.9,-2 -2,-2z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_check_box_outline_blank_white_24dp.xml b/src/main/res/drawable/ic_check_box_outline_blank_white_24dp.xml
new file mode 100644
index 0000000..3ecf661
--- /dev/null
+++ b/src/main/res/drawable/ic_check_box_outline_blank_white_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M19,5v14H5V5h14m0,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2V5c0,-1.1 -0.9,-2 -2,-2z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_check_box_white_24dp.xml b/src/main/res/drawable/ic_check_box_white_24dp.xml
new file mode 100644
index 0000000..473788c
--- /dev/null
+++ b/src/main/res/drawable/ic_check_box_white_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M19,3L5,3c-1.11,0 -2,0.9 -2,2v14c0,1.1 0.89,2 2,2h14c1.11,0 2,-0.9 2,-2L21,5c0,-1.1 -0.89,-2 -2,-2zM10,17l-5,-5 1.41,-1.41L10,14.17l7.59,-7.59L19,8l-9,9z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_radio_button_checked_black_24dp.xml b/src/main/res/drawable/ic_radio_button_checked_black_24dp.xml
new file mode 100644
index 0000000..a5025ae
--- /dev/null
+++ b/src/main/res/drawable/ic_radio_button_checked_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,7c-2.76,0 -5,2.24 -5,5s2.24,5 5,5 5,-2.24 5,-5 -2.24,-5 -5,-5zM12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_radio_button_checked_white_24dp.xml b/src/main/res/drawable/ic_radio_button_checked_white_24dp.xml
new file mode 100644
index 0000000..f6e8a94
--- /dev/null
+++ b/src/main/res/drawable/ic_radio_button_checked_white_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,7c-2.76,0 -5,2.24 -5,5s2.24,5 5,5 5,-2.24 5,-5 -2.24,-5 -5,-5zM12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_radio_button_unchecked_black_24dp.xml b/src/main/res/drawable/ic_radio_button_unchecked_black_24dp.xml
new file mode 100644
index 0000000..f61549b
--- /dev/null
+++ b/src/main/res/drawable/ic_radio_button_unchecked_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"/>
+</vector>
diff --git a/src/main/res/drawable/ic_radio_button_unchecked_white_24dp.xml b/src/main/res/drawable/ic_radio_button_unchecked_white_24dp.xml
new file mode 100644
index 0000000..42988f2
--- /dev/null
+++ b/src/main/res/drawable/ic_radio_button_unchecked_white_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"/>
+</vector>
diff --git a/src/main/res/layout-large/main.xml b/src/main/res/layout-large/main.xml
index 8a41388..f0ded90 100644
--- a/src/main/res/layout-large/main.xml
+++ b/src/main/res/layout-large/main.xml
@@ -85,7 +85,7 @@
       android:layout_below="@id/display"
       android:layout_alignLeft="@id/display"
       android:layout_alignParentRight="true"
-      android:drawableLeft="@android:drawable/radiobutton_on_background"
+      android:drawableLeft="?attr/radio_on"
       android:drawablePadding="8dp"
       android:text="@string/sine" />
 
@@ -96,7 +96,7 @@
       android:layout_below="@id/sine"
       android:layout_alignLeft="@id/display"
       android:layout_alignParentRight="true"
-      android:drawableLeft="@android:drawable/radiobutton_off_background"
+      android:drawableLeft="?attr/radio_off"
       android:drawablePadding="8dp"
       android:text="@string/square" />
 
@@ -107,7 +107,7 @@
       android:layout_below="@id/square"
       android:layout_alignLeft="@id/display"
       android:layout_alignParentRight="true"
-      android:drawableLeft="@android:drawable/radiobutton_off_background"
+      android:drawableLeft="?attr/radio_off"
       android:drawablePadding="8dp"
       android:text="@string/sawtooth" />
 
@@ -118,7 +118,7 @@
       android:layout_below="@id/sawtooth"
       android:layout_alignLeft="@id/display"
       android:layout_alignParentRight="true"
-      android:drawableLeft="@android:drawable/checkbox_off_background"
+      android:drawableLeft="?attr/check_off"
       android:drawablePadding="8dp"
       android:text="@string/mute" />
 
diff --git a/src/main/res/layout-small/main.xml b/src/main/res/layout-small/main.xml
index f6d3e1e..482631a 100644
--- a/src/main/res/layout-small/main.xml
+++ b/src/main/res/layout-small/main.xml
@@ -93,7 +93,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.0"
-        android:drawableLeft="@android:drawable/radiobutton_on_background"
+        android:drawableLeft="?attr/radio_on"
         android:drawablePadding="8dp"
         android:text="@string/s" />
 
@@ -102,7 +102,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.0"
-        android:drawableLeft="@android:drawable/radiobutton_off_background"
+        android:drawableLeft="?attr/radio_off"
         android:drawablePadding="8dp"
         android:text="@string/q" />
 
@@ -111,7 +111,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.0"
-        android:drawableLeft="@android:drawable/radiobutton_off_background"
+        android:drawableLeft="?attr/radio_off"
         android:drawablePadding="8dp"
         android:text="@string/w" />
 
@@ -161,7 +161,7 @@
       android:layout_alignBottom="@id/lower"
       android:layout_toLeftOf="@id/more"
       android:layout_toRightOf="@id/less"
-      android:drawableLeft="@android:drawable/checkbox_off_background"
+      android:drawableLeft="?attr/check_off"
       android:drawablePadding="8dp"
       android:text="@string/mute" />
 
diff --git a/src/main/res/layout/main.xml b/src/main/res/layout/main.xml
index b691347..84e843d 100644
--- a/src/main/res/layout/main.xml
+++ b/src/main/res/layout/main.xml
@@ -93,7 +93,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.0"
-        android:drawableLeft="@android:drawable/radiobutton_on_background"
+        android:drawableLeft="?attr/radio_on"
         android:drawablePadding="8dp"
         android:text="@string/sin" />
 
@@ -102,7 +102,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.0"
-        android:drawableLeft="@android:drawable/radiobutton_off_background"
+        android:drawableLeft="?attr/radio_off"
         android:drawablePadding="8dp"
         android:text="@string/squ" />
 
@@ -111,7 +111,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.0"
-        android:drawableLeft="@android:drawable/radiobutton_off_background"
+        android:drawableLeft="?attr/radio_off"
         android:drawablePadding="8dp"
         android:text="@string/saw" />
 
@@ -161,7 +161,7 @@
       android:layout_alignBottom="@id/lower"
       android:layout_toLeftOf="@id/more"
       android:layout_toRightOf="@id/less"
-      android:drawableLeft="@android:drawable/checkbox_off_background"
+      android:drawableLeft="?attr/check_off"
       android:drawablePadding="8dp"
       android:text="@string/mute" />
 
diff --git a/src/main/res/values/attrs.xml b/src/main/res/values/attrs.xml
index f498c6d..aa605f9 100644
--- a/src/main/res/values/attrs.xml
+++ b/src/main/res/values/attrs.xml
@@ -8,6 +8,10 @@
     <attr name="forward" format="reference" />
     <attr name="next" format="reference" />
     <attr name="previous" format="reference" />
+    <attr name="radio_off" format="reference" />
+    <attr name="radio_on" format="reference" />
+    <attr name="check_off" format="reference" />
+    <attr name="check_on" format="reference" />
 
     <attr name="pref_about" format="reference" />
     <attr name="pref_theme" format="reference" />
diff --git a/src/main/res/values/styles.xml b/src/main/res/values/styles.xml
index 6bddabd..ae36eaa 100644
--- a/src/main/res/values/styles.xml
+++ b/src/main/res/values/styles.xml
@@ -26,6 +26,10 @@
     <item name="forward">@drawable/ic_forward</item>
     <item name="next">@drawable/ic_chevron_right_black_24dp</item>
     <item name="previous">@drawable/ic_chevron_left_black_24dp</item>
+    <item name="radio_off">@drawable/ic_radio_button_unchecked_black_24dp</item>
+    <item name="radio_on">@drawable/ic_radio_button_checked_black_24dp</item>
+    <item name="check_off">@drawable/ic_check_box_outline_blank_black_24dp</item>
+    <item name="check_on">@drawable/ic_check_box_black_24dp</item>
 
     <item name="pref_about">@drawable/ic_action_about</item>
     <item name="pref_theme">@drawable/ic_action_brightness_high_light</item>
@@ -53,6 +57,10 @@
     <item name="forward">@drawable/ic_forward_dark</item>
     <item name="next">@drawable/ic_chevron_right_white_24dp</item>
     <item name="previous">@drawable/ic_chevron_left_white_24dp</item>
+    <item name="radio_off">@drawable/ic_radio_button_unchecked_white_24dp</item>
+    <item name="radio_on">@drawable/ic_radio_button_checked_white_24dp</item>
+    <item name="check_off">@drawable/ic_check_box_outline_blank_white_24dp</item>
+    <item name="check_on">@drawable/ic_check_box_white_24dp</item>
 
     <item name="pref_about">@drawable/ic_action_about_dark</item>
     <item name="pref_theme">@drawable/ic_action_brightness_high</item>