diff --git a/src/endiannessbox.cpp b/src/endiannessbox.cpp
new file mode 100644
--- /dev/null
+++ b/src/endiannessbox.cpp
@@ -0,0 +1,50 @@
+/*
+  Copyright © 2016 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  serialplot is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "endiannessbox.h"
+#include "ui_endiannessbox.h"
+
+EndiannessBox::EndiannessBox(QWidget *parent) :
+    QGroupBox(parent),
+    ui(new Ui::EndiannessBox)
+{
+    ui->setupUi(this);
+
+    connect(ui->rbLittleE, &QRadioButton::toggled, [this](bool checked)
+            {
+                emit selectionChanged(currentSelection());
+            });
+}
+
+EndiannessBox::~EndiannessBox()
+{
+    delete ui;
+}
+
+Endianness EndiannessBox::currentSelection()
+{
+    if (ui->rbLittleE->isChecked())
+    {
+        return LittleEndian;
+    }
+    else
+    {
+        return BigEndian;
+    }
+}