diff --git a/Controll.py b/Controll.py
index f42e3c1..675f6f7 100644
--- a/Controll.py
+++ b/Controll.py
@@ -1,25 +1,51 @@
+import sys
 import pysmu
+from PyQt5.QtWidgets import QApplication
+from GUI import MainWindow
 from DeviceController import DeviceController
-from GUI import MainWindow, startGUI
-import os
 
+def main():
+    # 1) Geräte einsammeln (pysmu nur hier benutzen)
+    sess = pysmu.Session()
+    sess.add_all()
 
-# --- Setup ---
-sess = pysmu.Session()
-sess.add_all()
-controllers = {dev.serial: DeviceController(dev) for dev in sess.devices}
-serials = list(controllers.keys())
-print(serials)
+    controllers = {dev.serial: DeviceController(dev) for dev in sess.devices}
+    serials = list(controllers.keys())
+    print("Gefundene Geräte:", serials)
 
-startGUI()
+    # Optional: Modi setzen
+    for serial in serials:
+        c = controllers[serial]
+        c.set_mode(0, pysmu.Mode.SIMV)  # CH A z. B.
+        c.set_mode(1, pysmu.Mode.HI_Z)  # CH B z. B.
 
-for i, serial in enumerate(serials):
-    c = controllers[serial]
-    print(c)
-    c.set_mode(0, pysmu.Mode.SIMV)  # CH A Hi-Z
-    c.set_mode(1, pysmu.Mode.HI_Z)  # CH B Hi-Z
-    MainWindow.add_list_item(MainWindow, serials[i], i, c.start, c.stop)
+    # 2) GUI erstellen
+    app = QApplication(sys.argv)
+    win = MainWindow()
 
+    # Kleine Helfer, damit die ListItem-Buttons nur Controller.start/stop aufrufen
+    def make_on_start(ctrl):
+        return lambda _idx: ctrl.start()
+
+    def make_on_stop(ctrl):
+        return lambda _idx: ctrl.stop()
+
+    # 3) Liste befüllen (auf der INSTANZ, nicht auf der Klasse!)
+    for i, serial in enumerate(serials):
+        ctrl = controllers[serial]
+        win.add_list_item(
+            text=serial,
+            index=i,
+            on_start=make_on_start(ctrl),
+            on_stop=make_on_stop(ctrl),
+        )
+
+    # 4) Start
+    win.show()
+    sys.exit(app.exec_())
+
+if __name__ == "__main__":
+    main()
 
 
 # # Beispiel: Gerät 1 starten, Gerät 2 später starten/stoppen