diff --git a/README.md b/README.md
index 2288e4e..be12f3a 100644
--- a/README.md
+++ b/README.md
@@ -85,7 +85,8 @@ Das System stellt einen vollständig konfigurierbaren Webserver bereit mit folge
 **Port-Konfiguration:**
 - Individuelle Benennung jedes Ports möglich
 - Aktivieren/Deaktivieren von Ports
-- Persistente Speicherung der Konfiguration in `portconfig.json`
+- Globale Blinkfrequenz für fehlerhafte Ports einstellbar (in ms)
+- Persistente Speicherung der Konfiguration in `portconfig.json`, inklusive Blinkintervall
 
 ### 📡 WiFi & Netzwerkverbindung
 
diff --git a/data/index.html b/data/index.html
index 2cef7af..793c2bb 100644
--- a/data/index.html
+++ b/data/index.html
@@ -6,6 +6,9 @@
     <link rel="stylesheet" href="style.css">
     <title>Port Status</title>
     <style>
+        :root {
+            --blink-duration: 1s;
+        }
         .port {
             margin: 10px;
             padding: 10px;
@@ -22,7 +25,7 @@
         }
         .missing {
             background-color: red;
-            animation: blink 1s infinite;
+            animation: blink var(--blink-duration) infinite;
         }
         @keyframes blink {
             0%, 50% { background-color: red; }
@@ -43,6 +46,9 @@
             try {
                 const response = await fetch('/status/data');
                 const data = await response.json();
+                if (data.blink_interval !== undefined) {
+                    updateBlinkDuration(data.blink_interval);
+                }
                 const container = document.getElementById('portsContainer');
                 container.innerHTML = '';
                 data.ports.forEach((port, index) => {
@@ -72,6 +78,12 @@
             }
         }
 
+        // blink length updater must be defined before starting
+        async function updateBlinkDuration(blinkInterval) {
+            const period = blinkInterval * 2;
+            document.documentElement.style.setProperty('--blink-duration', period + 'ms');
+        }
+
         loadStatus();
         setInterval(loadStatus, 1000); // Aktualisiere jede Sekunde
     </script>
diff --git a/data/portconfig.html b/data/portconfig.html
index 22f6878..b4bafc8 100644
--- a/data/portconfig.html
+++ b/data/portconfig.html
@@ -9,6 +9,9 @@
 <body>
     <h1>Port Konfiguration</h1>
     <form id="portForm">
+        <label>
+            Blinkintervall (ms): <input type="number" id="blinkInput" name="blink_interval" min="1" value="">
+        </label><br>
         <div id="portsContainer"></div>
         <input type="submit" value="Speichern">
     </form>
@@ -19,6 +22,9 @@
             try {
                 const response = await fetch('/portconfig/data');
                 const data = await response.json();
+                if (data.blink_interval !== undefined) {
+                    document.getElementById('blinkInput').value = data.blink_interval;
+                }
                 const container = document.getElementById('portsContainer');
                 container.innerHTML = '';
                 data.ports.forEach((port, index) => {
@@ -46,11 +52,14 @@
                     enabled: formData.has(`enabled${i}`)
                 });
             }
+            const blink = parseInt(formData.get('blink_interval')) || null;
+            const payload = { ports };
+            if (blink !== null) payload.blink_interval = blink;
             try {
                 await fetch('/portconfig', {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
-                    body: JSON.stringify({ ports })
+                    body: JSON.stringify(payload)
                 });
                 alert('Konfiguration gespeichert!');
                 loadConfig(); // Reload
diff --git a/src/Config.ino b/src/Config.ino
index 6f6541b..880c3ea 100644
--- a/src/Config.ino
+++ b/src/Config.ino
@@ -4,6 +4,9 @@
 
 #define NEOPIXEL_PIN D6
 #define BRIGHTNESS 100
-#define BLINK_INTERVAL 500  // Blink interval in milliseconds (0.5 seconds)
+#define DEFAULT_BLINK_INTERVAL 500  // Blink interval in milliseconds (0.5 seconds)
 #define SERIAL_SPEED 115200 // Serial Baudrate for ESP8266
 
+// runtime variable - can be modified via web configuration
+uint16_t blinkInterval = DEFAULT_BLINK_INTERVAL;
+
diff --git a/src/KeyPatch.ino b/src/KeyPatch.ino
index 43c37b3..63025cb 100644
--- a/src/KeyPatch.ino
+++ b/src/KeyPatch.ino
@@ -29,6 +29,10 @@ struct PortConfig {
   bool enabled;
 };
 
+// global blink interval stored along with port configuration
+// defined in Config.ino as a variable so it can be changed at runtime
+extern uint16_t blinkInterval;
+
 PCF8575 expander1(EXPANDER1ADDRESS);
 uint8_t portStates[AMOUNTOFPORTS];
 uint8_t lastStates[AMOUNTOFPORTS] = {0};
@@ -49,6 +53,10 @@ void loadPortConfig() {
         portConfigs[i].name = ports[i]["name"] | ("Port " + String(i));
         portConfigs[i].enabled = ports[i]["enabled"] | true;
       }
+      // read blink interval if present
+      if (doc.containsKey("blink_interval")) {
+        blinkInterval = doc["blink_interval"] | blinkInterval;
+      }
     } else {
       // Default
       for (int i = 0; i < AMOUNTOFPORTS; i++) {
@@ -73,6 +81,9 @@ void savePortConfig() {
     port["name"] = portConfigs[i].name;
     port["enabled"] = portConfigs[i].enabled;
   }
+  // store blink interval as well
+  doc["blink_interval"] = blinkInterval;
+
   File file = LittleFS.open("/portconfig.json", "w");
   if (file) {
     serializeJson(doc, file);
@@ -181,6 +192,8 @@ void setup() {
       port["name"] = portConfigs[i].name;
       port["enabled"] = portConfigs[i].enabled;
     }
+    // include current blink interval
+    doc["blink_interval"] = blinkInterval;
     String json;
     serializeJson(doc, json);
     server.send(200, "application/json", json);
@@ -195,6 +208,10 @@ void setup() {
         portConfigs[i].name = ports[i]["name"] | ("Port " + String(i));
         portConfigs[i].enabled = ports[i]["enabled"] | true;
       }
+      // update blink interval if provided
+      if (doc.containsKey("blink_interval")) {
+        blinkInterval = doc["blink_interval"] | blinkInterval;
+      }
       savePortConfig();
     }
     server.sendHeader("Location", "/portconfig");
@@ -222,6 +239,9 @@ void setup() {
       port["enabled"] = portConfigs[i].enabled;
       port["state"] = portStates[i];
     }
+    // include blink interval so the webpage can synchronize its animation
+    doc["blink_interval"] = blinkInterval;
+
     String json;
     serializeJson(doc, json);
     server.send(200, "application/json", json);
@@ -257,7 +277,7 @@ void loop() {
       if (portStates[i] == 0) {
         pixels->setPixelColor(i, pixels->Color(0, 150, 0)); // grün
       } else {
-        bool globalBlinkState = (millis() / BLINK_INTERVAL) % 2;
+        bool globalBlinkState = (millis() / blinkInterval) % 2;
         if (globalBlinkState) {
           pixels->setPixelColor(i, pixels->Color(150, 0, 0)); // rot
         } else {
diff --git a/src/html/index.html b/src/html/index.html
index 2cef7af..03213c9 100644
--- a/src/html/index.html
+++ b/src/html/index.html
@@ -6,6 +6,10 @@
     <link rel="stylesheet" href="style.css">
     <title>Port Status</title>
     <style>
+        /* blink duration is defined via CSS variable so we can update it dynamically */
+        :root {
+            --blink-duration: 1s; /* default, will be overwritten by script */
+        }
         .port {
             margin: 10px;
             padding: 10px;
@@ -22,7 +26,7 @@
         }
         .missing {
             background-color: red;
-            animation: blink 1s infinite;
+            animation: blink var(--blink-duration) infinite;
         }
         @keyframes blink {
             0%, 50% { background-color: red; }
@@ -39,10 +43,22 @@
 
 
     <script>
+        // when status data is received we update the blink animation length
+        async function updateBlinkDuration(blinkInterval) {
+            // period is two intervals (on+off)
+            const period = blinkInterval * 2;
+            document.documentElement.style.setProperty('--blink-duration', period + 'ms');
+        }
+
         async function loadStatus() {
             try {
                 const response = await fetch('/status/data');
                 const data = await response.json();
+                // synchronize blink rate on each update
+                if (data.blink_interval !== undefined) {
+                    updateBlinkDuration(data.blink_interval);
+                }
+
                 const container = document.getElementById('portsContainer');
                 container.innerHTML = '';
                 data.ports.forEach((port, index) => {
diff --git a/src/html/portconfig.html b/src/html/portconfig.html
index d39115d..db580be 100644
--- a/src/html/portconfig.html
+++ b/src/html/portconfig.html
@@ -9,6 +9,9 @@
 <body>
     <h1>Port Konfiguration</h1>
     <form id="portForm">
+        <label>
+            Blinkintervall (ms): <input type="number" id="blinkInput" name="blink_interval" min="1" value="">
+        </label><br>
         <div id="portsContainer"></div>
         <input type="submit" value="Speichern">
     </form>
@@ -20,6 +23,10 @@
             try {
                 const response = await fetch('/portconfig/data');
                 const data = await response.json();
+                // fill blink interval field if provided
+                if (data.blink_interval !== undefined) {
+                    document.getElementById('blinkInput').value = data.blink_interval;
+                }
                 const container = document.getElementById('portsContainer');
                 container.innerHTML = '';
                 data.ports.forEach((port, index) => {
@@ -47,11 +54,14 @@
                     enabled: formData.has(`enabled${i}`)
                 });
             }
+            const blink = parseInt(formData.get('blink_interval')) || null;
+            const payload = { ports };
+            if (blink !== null) payload.blink_interval = blink;
             try {
                 await fetch('/portconfig', {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
-                    body: JSON.stringify({ ports })
+                    body: JSON.stringify(payload)
                 });
                 alert('Konfiguration gespeichert!');
                 loadConfig(); // Reload
