diff --git a/APED/app/src/main/java/com/example/aped/ui/plots/PlotFragment.java b/APED/app/src/main/java/com/example/aped/ui/plots/PlotFragment.java
index b0b6a09..5288915 100644
--- a/APED/app/src/main/java/com/example/aped/ui/plots/PlotFragment.java
+++ b/APED/app/src/main/java/com/example/aped/ui/plots/PlotFragment.java
@@ -1,13 +1,15 @@
 package com.example.aped.ui.plots;
 
 import android.net.sip.SipSession;
+import android.content.DialogInterface;
 import android.os.Bundle;
 import androidx.fragment.app.Fragment;
-
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.Toast;
 import com.example.aped.MainActivity;
 import com.example.aped.R;
 import com.example.aped.communication.Communicator;
@@ -16,9 +18,9 @@ import com.jjoe64.graphview.GraphView;
 import com.jjoe64.graphview.series.DataPoint;
 import com.jjoe64.graphview.series.LineGraphSeries;
 
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import org.json.JSONException;
 import org.json.JSONObject;
-
 import java.util.ArrayList;
 import java.util.List;
 
@@ -30,6 +32,8 @@ public class PlotFragment extends Fragment {
     private List<String> bufferedDevices;
     /** Line Chart View that is displayed **/
     private GraphView graphView;
+    /** List of all the devices with buffers. **/
+    private List<String> bufferedDevicesSelected;
 
     /**
      *                                                                                          paul
@@ -51,12 +55,46 @@ public class PlotFragment extends Fragment {
 
         getBufferedValues(mainActivity.getDelivery(), mainActivity.getXml());
         mainActivity.getConfigurationHandler().setCurrentView(R.id.nav_plots);
+
+        Button buttonChoseDevice = view.findViewById(R.id.button_alert);
+        buttonChoseDevice.setOnClickListener(new View.OnClickListener() {
+
+            @Override
+            public void onClick(final View v) {
+                bufferedDevicesSelected = new ArrayList<>();
+                MaterialAlertDialogBuilder alertDialogBuilder = new MaterialAlertDialogBuilder(mainActivity);
+                alertDialogBuilder.setTitle("Choose your devices");
+                alertDialogBuilder.setMultiChoiceItems(bufferedDevices.toArray(new String[bufferedDevices.size()]), null, new DialogInterface.OnMultiChoiceClickListener() {
+                    @Override
+                    public void onClick(final DialogInterface dialog, final int which, final boolean isChecked) {
+                        if (isChecked) {
+                            bufferedDevicesSelected.add(bufferedDevices.get(which));
+                        } else if (bufferedDevices.contains(bufferedDevices.get(which))) {
+                            bufferedDevicesSelected.remove(bufferedDevices.get(which));
+                        }
+                    }
+                });
+                alertDialogBuilder.setPositiveButton("display", new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(final DialogInterface dialog, final int which) {
+                        String data = "";
+                        for (String item:bufferedDevicesSelected) {
+                            data = data + " " + item;
+                        }
+                        Toast.makeText(mainActivity, data, Toast.LENGTH_SHORT).show();
+                    }
+                });
+                alertDialogBuilder.create();
+                alertDialogBuilder.show();
+            }
+        });
+
         return view;
     }
 
-    private List<String> getBufferedDevices(IXML xml){
+    private List<String> getBufferedDevices(final IXML xml) {
         List<String> returnList = new ArrayList<>();
-        for (String deviceName : xml.getDeviceNames()){
+        for (String deviceName : xml.getDeviceNames()) {
            if (xml.getBufferSize(deviceName) > 0) {
                returnList.add(deviceName);
            }
@@ -64,17 +102,17 @@ public class PlotFragment extends Fragment {
         return returnList;
     }
 
-    private void getBufferedValues(Communicator communicator, IXML xml){
-        for (String deviceName : this.bufferedDevices){
-            communicator.readBuffer(deviceName,response -> {
+    private void getBufferedValues(final Communicator communicator, final IXML xml) {
+        for (String deviceName : this.bufferedDevices) {
+            communicator.readBuffer(deviceName, response -> {
                 try {
                     JSONObject buffer = response.getJSONObject("buffer");
-                    for(String pin : (List<String>) (xml.getPort(deviceName)).get("pins")) {
+                    for (String pin : (List<String>) (xml.getPort(deviceName)).get("pins")) {
                         String valueString = buffer.getString(pin);
-                        valueString = valueString.substring(2,valueString.length()-2);
+                        valueString = valueString.substring(2, valueString.length() - 2);
                         String[] valueStringArray = valueString.split("', '");
                         int[] values = new int[valueString.length()];
-                        for (int i = 0; i < valueStringArray.length; i++){
+                        for (int i = 0; i < valueStringArray.length; i++) {
                             values[i] = Integer.parseInt(valueStringArray[i]);
                         }
 
diff --git a/APED/app/src/main/res/layout/fragment_plot.xml b/APED/app/src/main/res/layout/fragment_plot.xml
index 7e7f063..a984a1f 100644
--- a/APED/app/src/main/res/layout/fragment_plot.xml
+++ b/APED/app/src/main/res/layout/fragment_plot.xml
@@ -9,4 +9,11 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/graph"/>
-</FrameLayout>
\ No newline at end of file
+        android:layout_height="match_parent"/>
+
+    <Button
+        android:id="@+id/button_alert"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="chose devices" />
+</FrameLayout>