diff --git a/whisper_local/microphone/__init__.py b/whisper_local/microphone/__init__.py
new file mode 100644
index 0000000..a613ce2
--- /dev/null
+++ b/whisper_local/microphone/__init__.py
@@ -0,0 +1,23 @@
+# whisper_local/microphone/__init__.py
+"""Mikrofon-Geräteüberwachung — plattformspezifische Backends."""
+import sys
+from collections.abc import Awaitable, Callable
+from typing import Protocol
+
+
+class MicrophoneMonitor(Protocol):
+    on_device_added: Callable[[str], Awaitable[None]] | None
+    on_device_removed: Callable[[str], Awaitable[None]] | None
+    on_configured_missing: Callable[[], Awaitable[None]] | None
+
+    async def start(self) -> None: ...
+    def stop(self) -> None: ...
+
+
+def create_monitor(configured_device: str | None) -> MicrophoneMonitor:
+    """Erstellt den plattformspezifischen Mikrofon-Monitor."""
+    if sys.platform == "win32":
+        from whisper_local.microphone._win32 import Win32Monitor
+        return Win32Monitor(configured_device)
+    from whisper_local.microphone._poll import PollMonitor
+    return PollMonitor(configured_device)