diff --git a/src/main/java/device/usbPlayer/UsbPlayer.java b/src/main/java/device/usbPlayer/UsbPlayer.java
index 87b63ab..65a2be0 100644
--- a/src/main/java/device/usbPlayer/UsbPlayer.java
+++ b/src/main/java/device/usbPlayer/UsbPlayer.java
@@ -2,9 +2,50 @@ package device.usbPlayer;
 
 import device.Device;
 
+import java.util.ArrayList;
+
 public class UsbPlayer implements Device {
 
-    private int Lautstaerke = 0;
+    private ArrayList<String> Playlist = new ArrayList<String>();
+    private String playTrack = "";
+    private Boolean isConnected;
+    private Boolean isDefect;
+    int Lautstaerke = 0;
+
+    //*********setters und getters********
+    public ArrayList<String> getPlaylist() {
+        return Playlist;
+    }
+
+    public void setPlaylist(ArrayList<String> playlist) {
+        Playlist = playlist;
+    }
+
+    public Boolean getDefect() {
+        return isDefect;
+    }
+
+    public void setDefect(Boolean defect) {
+        isDefect = defect;
+    }
+
+
+    public Boolean getConnected() {
+        return isConnected;
+    }
+
+    public void setConnected(Boolean connected) {
+        isConnected = connected;
+    }
+
+    public String getPlayTrack() {
+        return playTrack;
+    }
+
+    public void setPlayTrack(String playTrack) {
+        this.playTrack = playTrack;
+    }
+
 
     public void setLautstaerke(int ls) {
         if (ls <= 100) {
@@ -16,15 +57,35 @@ public class UsbPlayer implements Device {
         return Lautstaerke;
     }
 
-    @Override
-    public void louder() {
-        if(Lautstaerke < 100) {
-            Lautstaerke += 1;
-        } else {
-            Lautstaerke = 100;
+    //*********constructure********
+    public UsbPlayer() {
+        super();
+        isDefect = false;
+        isConnected = true;
+        Playlist.add("Musik 01.mp3");
+        Playlist.add("Musik 02.mp3");
+        Playlist.add("Musik 03.mp3");
+        playTrack = Playlist.get(0);
+
+    }
+    //**********search method*************
+    private boolean isAllAudio() {
+
+        String song = "";
+        boolean flag = true;
+
+        for (int i = 0; i < Playlist.size(); i++) {
+            song = Playlist.get(i).substring(Playlist.get(i).length() - 4);
+            if (song.equals(".mp3") | song.equals(".mp4") | song.equals(".wav")) {
+                flag = true;
+            } else {
+                flag = false;
+                break;
+            }
         }
+        return flag;
     }
-
+    //**********search method*************
     @Override
     public void quieter() {
         if(Lautstaerke > 0) {
@@ -34,6 +95,15 @@ public class UsbPlayer implements Device {
         }
     }
 
+    @Override
+    public void louder() {
+        if(Lautstaerke < 100) {
+            Lautstaerke += 1;
+        } else {
+            Lautstaerke = 100;
+        }
+    }
+
     @Override
     public int getVolume() {
         return 0;
@@ -67,7 +137,29 @@ public class UsbPlayer implements Device {
 
     @Override
     public String play() {
-        return null;
+        String result = "USB : ";
+        if (isConnected == true) {
+            result += "connected,";
+            if (isDefect == false) {
+                result += "working";
+                if (this.Playlist.size() != 0) {
+                    result += ",have a list";
+                    if (this.isAllAudio()) {
+                        result += ",Audio";
+                        if (!playTrack.equals(""))
+                            result += ",point to a track.";
+                        else
+                            result += ",doesn't point to a track.";
+                    } else {
+                        result += ",not Audio.";
+                    }
+                } else result += ",have no list.";
+            } else {
+                result += "not working.";
+            }
+        } else result = "not connected.";
+        return result;
+
     }
 
 }
diff --git a/src/test/java/device/radioPlayer/RadioPlayerTest.java b/src/test/java/device/radioPlayer/RadioPlayerTest.java
index 1d0549f..d45590c 100644
--- a/src/test/java/device/radioPlayer/RadioPlayerTest.java
+++ b/src/test/java/device/radioPlayer/RadioPlayerTest.java
@@ -2,7 +2,13 @@ package device.radioPlayer;
 
 
 import device.radioPlayer.RadioPlayer;
+import device.usbPlayer.UsbPlayer;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -43,22 +49,31 @@ class RadioPlayerTest {
     void getVolume() {
     }
 */
-    @Test
-    void next() {
-        rp.next();
-        int currentIndex=rp.Playlist.indexOf(rp.playTrack);
-        assertThat(rp.playTrack).isEqualTo(rp.Playlist.get((currentIndex)%rp.Playlist.size()));
-    }
-
-
-    @Test
-    void prev() {
-        rp.prev();
-        int currentIndex=rp.Playlist.indexOf(rp.playTrack);
-        assertThat(rp.playTrack).isEqualTo(rp.Playlist.get((currentIndex)%rp.Playlist.size()));
 
+    @ParameterizedTest
+    @MethodSource("prevNextOptions")
+    void prevNextTest(String testName, RadioPlayer testRp, String expectedResult) {
+        String station = testRp.playTrack;
+        assertThat(station).describedAs(testName).isEqualTo(expectedResult);
+}
+
+    static Stream<Arguments> prevNextOptions() {
+        RadioPlayer rp1 = new RadioPlayer();
+        RadioPlayer rp2 = new RadioPlayer();
+        RadioPlayer rp3 = new RadioPlayer();
+        rp1.next();
+        rp2.next();
+        rp2.prev();
+        rp3.prev();
+        return Stream.of(
+                Arguments.of("Next Station Test", rp1, "Radio Teddy"),
+                Arguments.of("Prev Station Test", rp2, "Radio YouFM"),
+                Arguments.of("Prev works on first Station ", rp3, "Radio MegaHits")
+        );
     }
+
 /*
+
     @Test
     void getInfoText() {
     }