diff --git a/whisper_local/__main__.py b/whisper_local/__main__.py
index ea259db..476cc0f 100644
--- a/whisper_local/__main__.py
+++ b/whisper_local/__main__.py
@@ -5,6 +5,7 @@ import logging
 import sys
 
 from whisper_local.config import Config, load_config
+from whisper_local.microphone import create_monitor
 from whisper_local.hotkey import create_listener
 from whisper_local.inserter import create_inserter
 from whisper_local.media import create_media_controller
@@ -52,6 +53,10 @@ class App:
         self.hotkey = create_listener(key_name=config.hotkey)
         self.hotkey.on_press = self.on_press
         self.hotkey.on_release = self.on_release
+        self.monitor = create_monitor(config.microphone or None)
+        self.monitor.on_device_added = self._on_microphone_added
+        self.monitor.on_device_removed = self._on_microphone_removed
+        self.monitor.on_configured_missing = self._on_configured_microphone_missing
         self.tray = create_tray(on_settings=self._open_settings, on_quit=self._quit)
 
     async def on_press(self) -> None:
@@ -93,6 +98,44 @@ class App:
         from whisper_local.tray._settings import SettingsDialog
         SettingsDialog(config=self._config, on_save=self._on_config_reload).open()
 
+    async def _on_configured_microphone_missing(self) -> None:
+        """Konfiguriertes Mikrofon nicht gefunden — auf Standard wechseln."""
+        from whisper_local.tray._notification import notify
+        device_name = self._config.microphone or "Mikrofon"
+        logger.warning("Konfiguriertes Mikrofon '%s' nicht gefunden, nutze Standard", device_name)
+        self.recorder = Recorder(
+            sample_rate=self._config.sample_rate,
+            channels=self._config.channels,
+            min_duration=self._config.min_duration,
+            device=None,
+        )
+        notify(
+            "Mikrofon nicht gefunden",
+            f'„{device_name}“ ist nicht verfügbar. Standard-Mikrofon wird verwendet.',
+        )
+        self.tray.set_warning("Mikrofon nicht gefunden")
+
+    async def _on_microphone_added(self, device_name: str) -> None:
+        """Neues Mikrofon erkannt — konfiguriertes Gerät ggf. wiederherstellen."""
+        if device_name != self._config.microphone:
+            return
+        from whisper_local.tray._notification import notify
+        logger.info("Konfiguriertes Mikrofon '%s' wieder verfügbar", device_name)
+        self.recorder = Recorder(
+            sample_rate=self._config.sample_rate,
+            channels=self._config.channels,
+            min_duration=self._config.min_duration,
+            device=self._config.microphone or None,
+        )
+        notify("Mikrofon verbunden", f'„{device_name}" ist wieder verfügbar.')
+        self.tray.set_warning(None)
+
+    async def _on_microphone_removed(self, device_name: str) -> None:
+        """Mikrofon entfernt — konfiguriertes Gerät → Fallback auslösen."""
+        logger.info("Mikrofon entfernt: %s", device_name)
+        if device_name == self._config.microphone:
+            await self._on_configured_microphone_missing()
+
     def _on_config_reload(self, new_config: Config) -> None:
         """Übernimmt neue Konfiguration ohne App-Neustart."""
         self._config = new_config
@@ -102,6 +145,14 @@ class App:
             min_duration=new_config.min_duration,
             device=new_config.microphone or None,
         )
+        self.monitor.stop()
+        self.monitor = create_monitor(new_config.microphone or None)
+        self.monitor.on_device_added = self._on_microphone_added
+        self.monitor.on_device_removed = self._on_microphone_removed
+        self.monitor.on_configured_missing = self._on_configured_microphone_missing
+        if self._loop is not None:
+            asyncio.run_coroutine_threadsafe(self.monitor.start(), self._loop)
+        self.tray.set_warning(None)
         old_media = self.media
         self.media = create_media_controller(
             enabled=new_config.pause_media_during_recording
@@ -128,6 +179,7 @@ class App:
         logger.info("whisper-local gestartet, warte auf Hotkey...")
         self.tray.start()
         self._hotkey_task = asyncio.create_task(self.hotkey.listen())
+        asyncio.create_task(self.monitor.start())
         await self._quit_event.wait()