diff --git a/Tonuino.ino b/Tonuino.ino
index fba9c51..a3b2030 100644
--- a/Tonuino.ino
+++ b/Tonuino.ino
@@ -53,6 +53,15 @@ public:
   static void OnCardRemoved(uint16_t code) {
     Serial.println(F("SD Karte entfernt "));
   }
+  static void OnUsbOnline(uint16_t code) {
+      Serial.println(F("USB online "));
+  }
+  static void OnUsbInserted(uint16_t code) {
+      Serial.println(F("USB bereit "));
+  }
+  static void OnUsbRemoved(uint16_t code) {
+    Serial.println(F("USB entfernt "));
+  }
 };
 
 static DFMiniMp3<SoftwareSerial, Mp3Notify> mp3(mySoftwareSerial);