diff --git a/AudioPriorityBar/AudioPriorityBarApp.swift b/AudioPriorityBar/AudioPriorityBarApp.swift
index 3f455e9..5afa34b 100644
--- a/AudioPriorityBar/AudioPriorityBarApp.swift
+++ b/AudioPriorityBar/AudioPriorityBarApp.swift
@@ -1,5 +1,6 @@
 import SwiftUI
 import CoreAudio
+import AVFoundation
 
 @main
 struct AudioPriorityBarApp: App {
@@ -171,6 +172,30 @@ class AudioManager: ObservableObject {
             applyHighestPriorityInput()
             applyHighestPriorityOutput()
         }
+        requestMicrophoneAccess()
+    }
+
+    /// macOS hides input device streams from apps without Microphone permission,
+    /// so input devices won't appear until access is granted. Request it on launch
+    /// and refresh the device list once the user responds.
+    private func requestMicrophoneAccess() {
+        switch AVCaptureDevice.authorizationStatus(for: .audio) {
+        case .authorized:
+            break
+        case .notDetermined:
+            AVCaptureDevice.requestAccess(for: .audio) { [weak self] _ in
+                Task { @MainActor in
+                    guard let self else { return }
+                    self.refreshDevices()
+                    self.refreshMuteStatus()
+                    if !self.isCustomMode {
+                        self.applyHighestPriorityInput()
+                    }
+                }
+            }
+        default:
+            break
+        }
     }
 
     private func setupMuteVolumeListener() {
diff --git a/AudioPriorityBar/Info.plist b/AudioPriorityBar/Info.plist
index 3aed840..33bf578 100644
--- a/AudioPriorityBar/Info.plist
+++ b/AudioPriorityBar/Info.plist
@@ -24,5 +24,7 @@
     <string>public.app-category.utilities</string>
     <key>LSUIElement</key>
     <true/>
+    <key>NSMicrophoneUsageDescription</key>
+    <string>Audio Priority Bar needs microphone access to list and manage your input (microphone) devices.</string>
 </dict>
 </plist>
diff --git a/AudioPriorityBar/Views/MenuBarView.swift b/AudioPriorityBar/Views/MenuBarView.swift
index 3ad55c2..4e8ee74 100644
--- a/AudioPriorityBar/Views/MenuBarView.swift
+++ b/AudioPriorityBar/Views/MenuBarView.swift
@@ -2,8 +2,16 @@ import SwiftUI
 import CoreAudio
 import AppKit
 
+private struct ContentHeightKey: PreferenceKey {
+    static var defaultValue: CGFloat = 0
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = max(value, nextValue())
+    }
+}
+
 struct MenuBarView: View {
     @EnvironmentObject var audioManager: AudioManager
+    @State private var contentHeight: CGFloat = 0
 
     var body: some View {
         VStack(spacing: 0) {
@@ -81,8 +89,14 @@ struct MenuBarView: View {
                 }
                 .padding(.horizontal, 16)
                 .padding(.vertical, 14)
+                .background(
+                    GeometryReader { proxy in
+                        Color.clear.preference(key: ContentHeightKey.self, value: proxy.size.height)
+                    }
+                )
             }
-            .frame(maxHeight: 420)
+            .frame(height: min(max(contentHeight, 1), 420))
+            .onPreferenceChange(ContentHeightKey.self) { contentHeight = $0 }
 
             Divider()
                 .padding(.horizontal, 12)