diff --git a/re/sniffer/sniffermodel.cpp b/re/sniffer/sniffermodel.cpp
index d700d9c..87a2422 100644
--- a/re/sniffer/sniffermodel.cpp
+++ b/re/sniffer/sniffermodel.cpp
@@ -11,7 +11,8 @@ SnifferModel::SnifferModel(QObject *parent)
       mNeverExpire(false),
       mFadeInactive(false),
       mMuteNotched(false),
-      mTimeSequence(0)
+      mTimeSequence(0),
+      mExpireInterval(5000)
 {
     QColor TextColor = QApplication::palette().color(QPalette::Text);
     if (TextColor.red() + TextColor.green() + TextColor.blue() < 200)
@@ -28,6 +29,10 @@ SnifferModel::~SnifferModel()
     mFilters.clear();
 }
 
+void SnifferModel::setExpireInterval(int newVal)
+{
+    mExpireInterval = newVal;
+}
 
 int SnifferModel::columnCount(const QModelIndex &parent) const
 {
@@ -220,6 +225,17 @@ void SnifferModel::clear()
     endResetModel();
 }
 
+void SnifferModel::updateNotchPoint()
+{
+    QMap<quint32, SnifferItem*>::iterator i;
+
+    /* update markers */
+    for (i = mMap.begin(); i != mMap.end(); ++i)
+    {
+        i.value()->updateMarker();
+    }
+}
+
 //Called from window with a timer (currently 200ms)
 void SnifferModel::refresh()
 {
@@ -229,13 +245,10 @@ void SnifferModel::refresh()
 
     mTimeSequence++;
 
-    /* update markers */
-
-
     for (i = mMap.begin(); i != mMap.end(); ++i)
     {
-        i.value()->updateMarker();
-        if(i.value()->elapsed()>5000 && !mNeverExpire)
+        //i.value()->updateMarker();
+        if(i.value()->elapsed() > mExpireInterval && !mNeverExpire)
             toRemove.append(i.key());
     }
 
diff --git a/re/sniffer/sniffermodel.h b/re/sniffer/sniffermodel.h
index 04ee5f8..7204618 100644
--- a/re/sniffer/sniffermodel.h
+++ b/re/sniffer/sniffermodel.h
@@ -46,6 +46,8 @@ public:
     void setNeverExpire(bool val);
     void setFadeInactive(bool val);
     void setMuteNotched(bool val);
+    void setExpireInterval(int newVal);
+    void updateNotchPoint();
 
 
 public slots:
@@ -65,6 +67,7 @@ private:
     bool                        mMuteNotched;
     bool                        mDarkMode;
     quint32                     mTimeSequence;
+    quint32                     mExpireInterval;
 };
 
 #endif // SNIFFERMODEL_H
diff --git a/re/sniffer/snifferwindow.cpp b/re/sniffer/snifferwindow.cpp
index 419c4e0..13e1d05 100644
--- a/re/sniffer/snifferwindow.cpp
+++ b/re/sniffer/snifferwindow.cpp
@@ -12,7 +12,7 @@ SnifferWindow::SnifferWindow(QWidget *parent) :
     QDialog(parent),
     ui(new Ui::snifferWindow),
     mModel(this),
-    mTimer(this),
+    mGUITimer(this),
     mFilter(false)
 {
     ui->setupUi(this);
@@ -35,8 +35,12 @@ SnifferWindow::SnifferWindow(QWidget *parent) :
     ui->listWidget->setSortingEnabled(true);
 
     /* connect timer */
-    connect(&mTimer, &QTimer::timeout, this, &SnifferWindow::update);
-    mTimer.setInterval(200);
+    connect(&mGUITimer, &QTimer::timeout, this, &SnifferWindow::update);
+    mGUITimer.setInterval(200);
+    connect(&mNotchTimer, &QTimer::timeout,this, &SnifferWindow::notchTick);
+    mNotchTimer.setInterval(ui->spinNotchInterval->value());
+
+    notchPingPong = false;
 
     /* connect buttons */
     connect(ui->btNotch, &QPushButton::clicked, &mModel, &SnifferModel::notch);
@@ -59,6 +63,8 @@ SnifferWindow::SnifferWindow(QWidget *parent) :
                 }
             }
     );
+    connect(ui->spinNotchInterval, QOverload<int>::of(&QSpinBox::valueChanged), this, [this](int i){mNotchTimer.setInterval(i);});
+    connect(ui->spinExpireInterval, QOverload<int>::of(&QSpinBox::valueChanged), this, [this](int i){mModel.setExpireInterval(i);});
 }
 
 SnifferWindow::~SnifferWindow()
@@ -113,7 +119,8 @@ void SnifferWindow::showEvent(QShowEvent* event)
 {
     QDialog::showEvent(event);
     connect(CANConManager::getInstance(), &CANConManager::framesReceived, &mModel, &SnifferModel::update);
-    mTimer.start();
+    mGUITimer.start();
+    mNotchTimer.start();
     readSettings();
     installEventFilter(this);
     qDebug() << "show";
@@ -124,7 +131,7 @@ void SnifferWindow::closeEvent(QCloseEvent *event)
 {
     Q_UNUSED(event);
     /* stop timer */
-    mTimer.stop();
+    mGUITimer.stop();
     /* disconnect reception of frames */
     disconnect(CANConManager::getInstance(), 0, this, 0);
     writeSettings();
@@ -161,6 +168,23 @@ void SnifferWindow::update()
     mModel.refresh();
 }
 
+void SnifferWindow::notchTick()
+{
+    notchPingPong = !notchPingPong;
+    if (notchPingPong)
+    {
+        ui->lblNotch->setBackgroundRole(QPalette::Link);
+        ui->lblNotch->repaint();
+        //qDebug() << "Tick";
+    }
+    else
+    {
+        ui->lblNotch->setBackgroundRole(QPalette::Background);
+        ui->lblNotch->repaint();
+        //qDebug() << "Tock";
+    }
+    mModel.updateNotchPoint();
+}
 
 void SnifferWindow::fltAll()
 {
diff --git a/re/sniffer/snifferwindow.h b/re/sniffer/snifferwindow.h
index 87d9338..3852761 100644
--- a/re/sniffer/snifferwindow.h
+++ b/re/sniffer/snifferwindow.h
@@ -39,6 +39,7 @@ public:
 
 public slots:
     void update();
+    void notchTick();
     void idChange(int, bool);
     void fltAll();
     void fltNone();
@@ -52,11 +53,13 @@ private:
 
     Ui::snifferWindow*          ui;
     SnifferModel                mModel;
-    QTimer                      mTimer;
+    QTimer                      mGUITimer;
+    QTimer                      mNotchTimer;
     QMap<int, QListWidgetItem*> mMap;
     bool                        mFilter;
     SnifferDelegate             *sniffDel;
     QAbstractItemDelegate       *defaultDel;
+    bool                        notchPingPong;
 };
 
 #endif // SNIFFER_H
diff --git a/ui/snifferwindow.ui b/ui/snifferwindow.ui
index 9adc67f..934ba60 100644
--- a/ui/snifferwindow.ui
+++ b/ui/snifferwindow.ui
@@ -28,22 +28,6 @@
     <layout class="QVBoxLayout" name="verticalLayout_2" stretch="0">
      <item>
       <layout class="QVBoxLayout" name="verticalLayout">
-       <item>
-        <spacer name="verticalSpacer_2">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeType">
-          <enum>QSizePolicy::Maximum</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
        <item>
         <widget class="QPushButton" name="btNotch">
          <property name="sizePolicy">
@@ -82,6 +66,100 @@
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QCheckBox" name="cbMuteNotched">
+         <property name="text">
+          <string>Mute notched bits</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>Notch Interval</string>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignCenter</set>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QSpinBox" name="spinNotchInterval">
+         <property name="suffix">
+          <string>ms</string>
+         </property>
+         <property name="minimum">
+          <number>100</number>
+         </property>
+         <property name="maximum">
+          <number>5000</number>
+         </property>
+         <property name="singleStep">
+          <number>10</number>
+         </property>
+         <property name="value">
+          <number>750</number>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLabel" name="lblNotch">
+         <property name="autoFillBackground">
+          <bool>true</bool>
+         </property>
+         <property name="text">
+          <string/>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="Line" name="line">
+         <property name="minimumSize">
+          <size>
+           <width>0</width>
+           <height>4</height>
+          </size>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Plain</enum>
+         </property>
+         <property name="lineWidth">
+          <number>2</number>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLabel" name="label_2">
+         <property name="text">
+          <string>Expire Interval</string>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignCenter</set>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QSpinBox" name="spinExpireInterval">
+         <property name="suffix">
+          <string>ms</string>
+         </property>
+         <property name="minimum">
+          <number>1000</number>
+         </property>
+         <property name="maximum">
+          <number>100000</number>
+         </property>
+         <property name="singleStep">
+          <number>200</number>
+         </property>
+         <property name="value">
+          <number>5000</number>
+         </property>
+        </widget>
+       </item>
        <item>
         <widget class="QCheckBox" name="cbNoExpire">
          <property name="text">
@@ -90,9 +168,21 @@
         </widget>
        </item>
        <item>
-        <widget class="QCheckBox" name="cbMuteNotched">
-         <property name="text">
-          <string>Mute notched bits</string>
+        <widget class="Line" name="line_2">
+         <property name="minimumSize">
+          <size>
+           <width>0</width>
+           <height>4</height>
+          </size>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Plain</enum>
+         </property>
+         <property name="lineWidth">
+          <number>2</number>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
          </property>
         </widget>
        </item>
@@ -121,7 +211,7 @@
          <property name="sizeHint" stdset="0">
           <size>
            <width>20</width>
-           <height>40</height>
+           <height>25</height>
           </size>
          </property>
         </spacer>