diff --git a/sketch/obd2_gauge/meter.h b/sketch/obd2_gauge/meter.h
index 1373466..9379c7e 100644
--- a/sketch/obd2_gauge/meter.h
+++ b/sketch/obd2_gauge/meter.h
@@ -1365,6 +1365,53 @@ void updateMeter(uint8_t pidNo, String response) { // update parameter on screen
 }
 /*-------------------------------*/
 
+// Non-blocking alarm sound generator: classic Casio double-chirp [bip-bip] every 1 second
+uint32_t lastAlarmSoundCycle = 0;
+uint8_t alarmSoundStep = 0;
+uint32_t alarmSoundStepTime = 0;
+
+void handleAlarmSound(bool anyAlarmActive) {
+  if (!anyAlarmActive || buzzerVolumeLevel == 0) {
+    if (alarmSoundStep != 0) {
+      ledcWrite(buzzerChannel, 0);
+      alarmSoundStep = 0;
+    }
+    return;
+  }
+
+  uint32_t now = millis();
+  uint16_t duty = VOL_DUTY_TABLE[buzzerVolumeLevel > 5 ? 3 : buzzerVolumeLevel];
+
+  // Pattern: [25ms chirp] -> 35ms pause -> [25ms chirp] -> pause until 1000ms
+  if (alarmSoundStep == 0) {
+    if (now - lastAlarmSoundCycle >= 1000) {
+      lastAlarmSoundCycle = now;
+      alarmSoundStep = 1;
+      alarmSoundStepTime = now;
+      ledcSetup(buzzerChannel, 4096, 10);
+      ledcWrite(buzzerChannel, duty);
+    }
+  } else if (alarmSoundStep == 1) { // 25ms first chirp
+    if (now - alarmSoundStepTime >= 25) {
+      ledcWrite(buzzerChannel, 0);
+      alarmSoundStep = 2;
+      alarmSoundStepTime = now;
+    }
+  } else if (alarmSoundStep == 2) { // 35ms gap
+    if (now - alarmSoundStepTime >= 35) {
+      ledcSetup(buzzerChannel, 4096, 10);
+      ledcWrite(buzzerChannel, duty);
+      alarmSoundStep = 3;
+      alarmSoundStepTime = now;
+    }
+  } else if (alarmSoundStep == 3) { // 25ms second chirp
+    if (now - alarmSoundStepTime >= 25) {
+      ledcWrite(buzzerChannel, 0);
+      alarmSoundStep = 0;
+    }
+  }
+}
+
 // Non-blocking handler to blink/flash arcs and numerical values on alarm (when in TFT_RED)
 void handleArcAlarmFlash() {
   uint32_t now = millis();
@@ -1375,6 +1422,8 @@ void handleArcAlarmFlash() {
     toggleTick = true;
   }
 
+  bool anyInRedAlarm = false;
+
   if (fullScreenCell >= 0 && fullScreenCell < 4) {
     uint8_t cell = fullScreenCell;
     if (last_valid_data[cell] != -999) {
@@ -1383,6 +1432,7 @@ void handleArcAlarmFlash() {
       float data = last_valid_data[cell];
       uint16_t col = getMeterColor(pidIdx, data, warn);
       bool inRed = (col == TFT_RED);
+      if (inRed) anyInRedAlarm = true;
       bool digit = pidConfig[pidIdx][7].toInt();
       String numStr = String(data, digit);
 
@@ -1466,6 +1516,7 @@ void handleArcAlarmFlash() {
         float data = last_valid_data[cell];
         uint16_t col = getMeterColor(pidIdx, data, warn);
         bool inRed = (col == TFT_RED);
+        if (inRed) anyInRedAlarm = true;
         bool digit = pidConfig[pidIdx][7].toInt();
         String numStr = String(data, digit);
         int x = cell4_x[cell];
@@ -1544,6 +1595,7 @@ void handleArcAlarmFlash() {
       }
     }
   }
+  handleAlarmSound(anyInRedAlarm);
 }
 
 // Target and current brightness variables for smooth fade
diff --git a/sketch/obd2_gauge/obd2_gauge.ino b/sketch/obd2_gauge/obd2_gauge.ino
index f3aad5b..8c4add2 100644
--- a/sketch/obd2_gauge/obd2_gauge.ino
+++ b/sketch/obd2_gauge/obd2_gauge.ino
@@ -94,7 +94,7 @@ String warningValue[4] = { "106", "5000", "15.0", "130" };
 bool alarmEnabled[4] = { true, true, true, true };
 
 // Buzzer volume control table (0: Silencio, 1: Ultra Bajo, 2: Muy Bajo, 3: Bajo/Casio, 4: Medio, 5: Alto)
-const uint16_t VOL_DUTY_TABLE[6] = { 0, 5, 18, 50, 140, 380 };
+const uint16_t VOL_DUTY_TABLE[6] = { 0, 2, 8, 25, 80, 250 };
 const char* const VOL_NAME_TABLE[6] = { "SILENCIO", "ULTRA BAJO", "MUY BAJO", "BAJO (CASIO)", "MEDIO", "ALTO" };
 uint8_t buzzerVolumeLevel = 3; // Default 3: Bajo (Casio suave)