diff --git a/src/main/java/BordComputer.java b/src/main/java/BordComputer.java
index b00ec43..21f6b38 100644
--- a/src/main/java/BordComputer.java
+++ b/src/main/java/BordComputer.java
@@ -2,6 +2,7 @@ import device.Device;
 import device.cdPlayer.CD;
 import device.cdPlayer.CDPlayer;
 import device.radioPlayer.RadioPlayer;
+import device.usbPlayer.USB_Stick;
 import device.usbPlayer.UsbPlayer;
 
 import java.io.FileReader;
@@ -56,20 +57,28 @@ public class BordComputer {
         return null;
     }
     public void meetAllPreconditionForPlay(){
+        if(activeDevice instanceof CDPlayer) {
+            String[] audioPlayList = new String[]{"Audio 01", "Audio 02", "Audio 03", "Audio 04", "Audio 05"};
+            CD audioCD1 = new CD("Audio", "PopMusic", audioPlayList, "XAc20044");
+            CD audioCD2 = new CD("Audio", "RockMusic", audioPlayList, "BLXPP78");
 
-        String[] audioPlayList = new String[]{"Audio 01", "Audio 02", "Audio 03", "Audio 04", "Audio 05"};
-        CD audioCD1 = new CD("Audio", "PopMusic", audioPlayList, "XAc20044");
-        CD audioCD2=new CD("Audio","RockMusic",audioPlayList,"BLXPP78");
+            CDPlayer cdPlayer = (CDPlayer) activeDevice;
+            cdPlayer.changePlaySource();
+            cdPlayer.loadCDWechseler(audioCD1, 0);
+            cdPlayer.loadCDWechseler(audioCD2, 1);
 
-        CDPlayer cdPlayer=(CDPlayer) activeDevice;
-        cdPlayer.changePlaySource();
-        cdPlayer.loadCDWechseler(audioCD1, 0);
-        cdPlayer.loadCDWechseler(audioCD2, 1);
+            cdPlayer.setCD(cdPlayer.getCdWechseler().getCDList().get(0));
+            activeDevice = cdPlayer;
+        }
+        if(activeDevice instanceof UsbPlayer) {
+            USB_Stick USBDrive = new USB_Stick();
+            UsbPlayer up1 = new UsbPlayer(USBDrive);
+            activeDevice = up1;
+        }
 
-        cdPlayer.setCD(cdPlayer.getCdWechseler().getCDList().get(0));
-        activeDevice=cdPlayer;
     }
 
+
     public void setActiveDevice(Device activeDevice) {
         this.activeDevice = activeDevice;
     }
diff --git a/src/main/java/device/usbPlayer/USB_Stick.java b/src/main/java/device/usbPlayer/USB_Stick.java
index 39817e9..5cf7b9f 100644
--- a/src/main/java/device/usbPlayer/USB_Stick.java
+++ b/src/main/java/device/usbPlayer/USB_Stick.java
@@ -8,7 +8,7 @@ public class USB_Stick {
     public ArrayList<ArrayList<String>> Folders = new ArrayList<>();
     int currentAlbum ;
 
-    USB_Stick() {
+    public USB_Stick() {
         ArrayList<String> a1 = new ArrayList<String>();
         a1.add("Musik 01.mp3");
         a1.add("Musik 02.mp3");
diff --git a/src/test/java/BordComputerTest.java b/src/test/java/BordComputerTest.java
index fcdf1e3..31689aa 100644
--- a/src/test/java/BordComputerTest.java
+++ b/src/test/java/BordComputerTest.java
@@ -94,6 +94,12 @@ class BordComputerTest {
             bordComputer.setActiveDevice(radioPlayer);
             assertThat(bordComputer.play()).describedAs(testName).isNotEqualTo(null);
         }
+        if(testCase.equals("Case3")) {
+            Device usbPlayer=bordComputer.getInstanceByName(instanceName);
+            bordComputer.setActiveDevice(usbPlayer);
+            bordComputer.meetAllPreconditionForPlay();
+            assertThat(bordComputer.play()).describedAs(testName).isNotEqualTo(null);
+        }
     }
 
     static Stream<Arguments> playDate()throws ClassNotFoundException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
@@ -101,7 +107,8 @@ class BordComputerTest {
             bordComputer.readConfig();
         return Stream.of(
                 Arguments.of("[CDPlayer-> play(): after all preconditions are met] => ShouldReturnAnItemToPlay","Case1",bordComputer,"CDPlayer"),
-                Arguments.of("[RadioPlayer-> play(): after all preconditions are met] => ShouldReturnAnItemToPlay","Case2",bordComputer,"RadioPlayer")
+                Arguments.of("[RadioPlayer-> play(): after all preconditions are met] => ShouldReturnAnItemToPlay","Case2",bordComputer,"RadioPlayer"),
+                Arguments.of("[UsbPlayer-> play(): after all preconditions are met] => ShouldReturnAnItemToPlay","Case3",bordComputer,"UsbPlayer")
         );
     }