diff --git a/BLEUnlock/AppDelegate.swift b/BLEUnlock/AppDelegate.swift
index 4ee9c91..407bddd 100644
--- a/BLEUnlock/AppDelegate.swift
+++ b/BLEUnlock/AppDelegate.swift
@@ -16,6 +16,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
     let unlockRSSIMenu = NSMenu()
     let timeoutMenu = NSMenu()
     let lockDelayMenu = NSMenu()
+    let externalDisplayMenu = NSMenu()
     var deviceDict: [UUID: NSMenuItem] = [:]
     var monitorMenuItem : NSMenuItem?
     let prefs = UserDefaults.standard
@@ -30,6 +31,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
     var unlockedAt = 0.0
     var inScreensaver = false
     var lastRSSI: Int? = nil
+    var externalDisplayModelOnly = false
 
     func menuWillOpen(_ menu: NSMenu) {
         if menu == deviceMenu {
@@ -66,6 +68,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
                     item.state = .off
                 }
             }
+        } else if menu == externalDisplayMenu {
+            updateExternalMonitor()
         }
     }
 
@@ -277,6 +281,60 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         return false
     }
     
+    func getDisplayUUIDs() -> [(localizedName: String, uuidString: String)] {
+        var displayInfoArray: [(localizedName: String, uuidString: String)] = []
+        
+        let screens = NSScreen.screens
+        for screen in screens {
+            let deviceDescription = screen.deviceDescription
+            if let screenNumber = deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as? CGDirectDisplayID {
+                let uuidRef = CGDisplayCreateUUIDFromDisplayID(screenNumber)?.takeRetainedValue()
+                if let uuidRef = uuidRef {
+                    let uuidString = CFUUIDCreateString(kCFAllocatorDefault, uuidRef) as String
+                    if #available(macOS 10.15, *) {
+                        displayInfoArray.append((localizedName: screen.localizedName, uuidString: uuidString))
+                    } else {
+                        displayInfoArray.append((localizedName: uuidString, uuidString: uuidString))
+                    }
+                }
+            }
+        }
+        return displayInfoArray
+    }
+    
+    func updateExternalMonitor() {
+        externalDisplayMenu.removeAllItems()
+        let selectedDisplayUUIDs = prefs.array(forKey: "externalDisplays") as? [String] ?? []
+        let displays = getDisplayUUIDs()
+        
+        for display in displays {
+            let menuItem = NSMenuItem(title: display.localizedName, action: nil, keyEquivalent: "")
+            menuItem.representedObject = display.uuidString
+            
+            if display.localizedName.contains("Built-in") {
+                menuItem.isEnabled = false
+            } else {
+                menuItem.action = #selector(setExternalDisplays(_:))
+                menuItem.target = self
+                menuItem.state = selectedDisplayUUIDs.contains(display.uuidString) ? .on : .off
+            }
+            
+            externalDisplayMenu.addItem(menuItem)
+        }
+    }
+    
+    func isExternalDisplayConnected() -> Bool {
+        let selectedDisplayUUIDs = prefs.array(forKey: "externalDisplays") as? [String] ?? []
+        
+        if selectedDisplayUUIDs.isEmpty {
+            return false
+        }
+        
+        let connectedDisplayUUIDs = getDisplayUUIDs().map { $0.uuidString }
+        
+        return selectedDisplayUUIDs.allSatisfy { connectedDisplayUUIDs.contains($0) }
+    }
+    
     func tryUnlockScreen() {
         guard !manualLock else { return }
         guard ble.presence else { return }
@@ -291,6 +349,11 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
             CGEvent(keyboardEventSource: src, virtualKey: 0x35, keyDown: true)?.post(tap: .cghidEventTap)
             CGEvent(keyboardEventSource: src, virtualKey: 0x35, keyDown: false)?.post(tap: .cghidEventTap)
         }
+        
+        if self.prefs.bool(forKey: "externalDisplayModelOnly") && !isExternalDisplayConnected() {
+            print("External Display is not connected")
+            return
+        }
 
         guard !self.prefs.bool(forKey: "wakeWithoutUnlocking") else { return }
 
@@ -489,6 +552,12 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         menuItem.state = value ? .on : .off
         prefs.set(value, forKey: "wakeOnProximity")
     }
+    
+    @objc func toggleExternalDisplayModeOnly(_ menuItem: NSMenuItem) {
+        let value = !prefs.bool(forKey: "externalDisplayModelOnly")
+        menuItem.state = value ? .on : .off
+        prefs.set(value, forKey: "externalDisplayModelOnly")
+    }
 
     @objc func setLockRSSI(_ menuItem: NSMenuItem) {
         let value = menuItem.tag
@@ -551,6 +620,20 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         prefs.set(wakeWithoutUnlocking, forKey: "wakeWithoutUnlocking")
         menuItem.state = wakeWithoutUnlocking ? .on : .off
     }
+    
+    @objc func setExternalDisplays(_ menuItem: NSMenuItem) {
+        guard let uuidString = menuItem.representedObject as? String else { return }
+      
+        menuItem.state = (menuItem.state == .on) ? .off : .on
+      
+        var selectedDisplayUUIDs = prefs.array(forKey: "externalDisplays") as? [String] ?? []
+        if menuItem.state == .on {
+            selectedDisplayUUIDs.append(uuidString)
+        } else {
+            selectedDisplayUUIDs.removeAll { $0 == uuidString }
+        }
+        prefs.set(selectedDisplayUUIDs, forKey: "externalDisplays")
+    }
 
     @objc func lockNow() {
         guard !isScreenLocked() else { return }
@@ -622,6 +705,17 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuDelegate, NSMenuItemVa
         if prefs.bool(forKey: "wakeOnProximity") {
             item.state = .on
         }
+        
+        mainMenu.addItem(NSMenuItem.separator())
+        item = mainMenu.addItem(withTitle: t("external_display_mode_only"), action: #selector(toggleExternalDisplayModeOnly), keyEquivalent: "")
+        if prefs.bool(forKey: "externalDisplayModelOnly") {
+            item.state = .on
+        }
+        
+        item = mainMenu.addItem(withTitle: t("external_displays"), action: nil, keyEquivalent: "")
+        item.submenu = externalDisplayMenu
+        externalDisplayMenu.delegate = self
+        mainMenu.addItem(NSMenuItem.separator())
 
         item = mainMenu.addItem(withTitle: t("wake_without_unlocking"), action: #selector(toggleWakeWithoutUnlocking), keyEquivalent: "")
         if prefs.bool(forKey: "wakeWithoutUnlocking") {
diff --git a/BLEUnlock/Base.lproj/Localizable.strings b/BLEUnlock/Base.lproj/Localizable.strings
index 4e75488..ff9be37 100644
--- a/BLEUnlock/Base.lproj/Localizable.strings
+++ b/BLEUnlock/Base.lproj/Localizable.strings
@@ -36,3 +36,5 @@
 "use_screensaver_to_lock" = "Use Screensaver to Lock";
 "wake_on_proximity" = "Wake on Proximity";
 "wake_without_unlocking" = "Wake without Unlocking";
+"external_display_mode_only" = "External Display Detection";
+"external_displays" = "External Displays";
diff --git a/BLEUnlock/Info.plist b/BLEUnlock/Info.plist
index a871345..678853a 100644
--- a/BLEUnlock/Info.plist
+++ b/BLEUnlock/Info.plist
@@ -19,7 +19,7 @@
 	<key>CFBundleShortVersionString</key>
 	<string>1.12.2</string>
 	<key>CFBundleVersion</key>
-	<string>796</string>
+	<string>847</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>
diff --git a/BLEUnlock/de.lproj/Localizable.strings b/BLEUnlock/de.lproj/Localizable.strings
index c9d978e..3ed36bb 100644
--- a/BLEUnlock/de.lproj/Localizable.strings
+++ b/BLEUnlock/de.lproj/Localizable.strings
@@ -36,3 +36,5 @@
 "use_screensaver_to_lock" = "Den Bildschirmschoner verwenden zum Sperren";
 "wake_on_proximity" = "Aufwachen bei Annäherung";
 "wake_without_unlocking" = "Aufwachen ohne Entsperren";
+"external_display_mode_only" = "Externer Bildschirm Erkennung";
+"external_displays" = "Externe Bildschirme";