diff --git a/app.php b/app.php
index df6c949..9e9194c 100644
--- a/app.php
+++ b/app.php
@@ -27,7 +27,6 @@ function ensure_recliner_schema(): void
             angle_deg TINYINT UNSIGNED NOT NULL,
             intensity_pct TINYINT UNSIGNED NOT NULL,
             pattern_mode VARCHAR(20) NOT NULL,
-            duration_ms SMALLINT UNSIGNED NOT NULL,
             notes VARCHAR(255) DEFAULT NULL,
             created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
@@ -41,7 +40,6 @@ function default_preset(): array
         'angle_deg' => 112,
         'intensity_pct' => 44,
         'pattern_mode' => 'continuous',
-        'duration_ms' => 1400,
         'notes' => 'Balanced demo profile for a calm showroom preview.',
     ];
 }
@@ -69,13 +67,6 @@ function validate_preset_input(array $input): array
         $errors['intensity_pct'] = 'Intensity must be between 0% and 100%.';
     }
 
-    $duration = filter_var($input['duration_ms'] ?? null, FILTER_VALIDATE_INT, [
-        'options' => ['min_range' => 100, 'max_range' => 5000],
-    ]);
-    if ($duration === false) {
-        $errors['duration_ms'] = 'Duration must be between 100 ms and 5000 ms.';
-    }
-
     $pattern = (string) ($input['pattern_mode'] ?? 'continuous');
     if (!in_array($pattern, RECLINER_PATTERNS, true)) {
         $errors['pattern_mode'] = 'Choose a supported vibration pattern.';
@@ -93,7 +84,6 @@ function validate_preset_input(array $input): array
             'angle_deg' => $angle === false ? 0 : (int) $angle,
             'intensity_pct' => $intensity === false ? 0 : (int) $intensity,
             'pattern_mode' => $pattern,
-            'duration_ms' => $duration === false ? 1000 : (int) $duration,
             'notes' => $notes,
         ],
     ];
@@ -102,15 +92,14 @@ function validate_preset_input(array $input): array
 function save_preset(array $data): int
 {
     $stmt = db()->prepare(
-        'INSERT INTO recliner_presets (name, angle_deg, intensity_pct, pattern_mode, duration_ms, notes)
-         VALUES (:name, :angle_deg, :intensity_pct, :pattern_mode, :duration_ms, :notes)'
+        'INSERT INTO recliner_presets (name, angle_deg, intensity_pct, pattern_mode, notes)
+         VALUES (:name, :angle_deg, :intensity_pct, :pattern_mode, :notes)'
     );
 
     $stmt->bindValue(':name', $data['name'], PDO::PARAM_STR);
     $stmt->bindValue(':angle_deg', $data['angle_deg'], PDO::PARAM_INT);
     $stmt->bindValue(':intensity_pct', $data['intensity_pct'], PDO::PARAM_INT);
     $stmt->bindValue(':pattern_mode', $data['pattern_mode'], PDO::PARAM_STR);
-    $stmt->bindValue(':duration_ms', $data['duration_ms'], PDO::PARAM_INT);
     $stmt->bindValue(':notes', $data['notes'] !== '' ? $data['notes'] : null, $data['notes'] !== '' ? PDO::PARAM_STR : PDO::PARAM_NULL);
     $stmt->execute();
 
@@ -121,7 +110,7 @@ function get_recent_presets(int $limit = 8): array
 {
     $limit = max(1, min(24, $limit));
     $stmt = db()->query(
-        'SELECT id, name, angle_deg, intensity_pct, pattern_mode, duration_ms, notes, created_at
+        'SELECT id, name, angle_deg, intensity_pct, pattern_mode, notes, created_at
          FROM recliner_presets
          ORDER BY created_at DESC, id DESC
          LIMIT ' . $limit
@@ -133,7 +122,7 @@ function get_recent_presets(int $limit = 8): array
 function get_preset(int $id): ?array
 {
     $stmt = db()->prepare(
-        'SELECT id, name, angle_deg, intensity_pct, pattern_mode, duration_ms, notes, created_at
+        'SELECT id, name, angle_deg, intensity_pct, pattern_mode, notes, created_at
          FROM recliner_presets
          WHERE id = :id
          LIMIT 1'
@@ -163,4 +152,4 @@ function preset_tone(int $angle): string
 function e(?string $value): string
 {
     return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
-}
+}
\ No newline at end of file
diff --git a/assets/js/main.js b/assets/js/main.js
index f6781e6..b1c94e6 100644
--- a/assets/js/main.js
+++ b/assets/js/main.js
@@ -8,7 +8,6 @@ document.addEventListener('DOMContentLoaded', () => {
         angle: document.getElementById('angle_deg'),
         intensity: document.getElementById('intensity_pct'),
         pattern: document.getElementById('pattern_mode'),
-        duration: document.getElementById('duration_ms'),
         name: document.getElementById('name'),
         notes: document.getElementById('notes')
     };
@@ -18,19 +17,15 @@ document.addEventListener('DOMContentLoaded', () => {
         angleValue: document.getElementById('angle-value'),
         anglePill: document.getElementById('angle-pill'),
         intensityPill: document.getElementById('intensity-pill'),
-        durationPill: document.getElementById('duration-pill'),
         statAngle: document.getElementById('stat-angle'),
         statIntensity: document.getElementById('stat-intensity'),
         statPattern: document.getElementById('stat-pattern'),
-        statDuration: document.getElementById('stat-duration'),
         saveAngle: document.getElementById('save-angle'),
         saveIntensity: document.getElementById('save-intensity'),
         savePattern: document.getElementById('save-pattern'),
-        saveDuration: document.getElementById('save-duration'),
         summaryAngle: document.getElementById('summary-angle'),
         summaryIntensity: document.getElementById('summary-intensity'),
         summaryPattern: document.getElementById('summary-pattern'),
-        summaryTone: document.getElementById('summary-tone'),
         reclineMode: document.getElementById('recline-mode'),
         gamepadState: document.getElementById('gamepad-state'),
         gamepadSelect: document.getElementById('gamepad-select'),
@@ -40,6 +35,7 @@ document.addEventListener('DOMContentLoaded', () => {
 
     let knownGamepads = [];
     let scanTimer = null;
+    let continuousVibrationInterval = null;
 
     const notify = (message) => {
         if (!message) {
@@ -63,8 +59,7 @@ document.addEventListener('DOMContentLoaded', () => {
     const currentState = () => ({
         angle: Number(controls.angle?.value || 0),
         intensity: Number(controls.intensity?.value || 0),
-        pattern: controls.pattern?.value || 'continuous',
-        duration: Number(controls.duration?.value || 1000)
+        pattern: controls.pattern?.value || 'continuous'
     });
 
     const updateVisualization = () => {
@@ -79,19 +74,15 @@ document.addEventListener('DOMContentLoaded', () => {
             angleValue: `${state.angle}`,
             anglePill: `${state.angle}°`,
             intensityPill: `${state.intensity}%`,
-            durationPill: `${state.duration} ms`,
             statAngle: `${state.angle}°`,
             statIntensity: `${state.intensity}%`,
             statPattern: capitalize(state.pattern),
-            statDuration: `${state.duration} ms`,
             saveAngle: `${state.angle}°`,
             saveIntensity: `${state.intensity}%`,
             savePattern: capitalize(state.pattern),
-            saveDuration: `${state.duration} ms`,
             summaryAngle: `${state.angle}°`,
             summaryIntensity: `${state.intensity}%`,
             summaryPattern: capitalize(state.pattern),
-            summaryTone: tone,
             reclineMode: tone
         };
 
@@ -109,7 +100,6 @@ document.addEventListener('DOMContentLoaded', () => {
         if (controls.angle && preset.angle_deg !== undefined) controls.angle.value = preset.angle_deg;
         if (controls.intensity && preset.intensity_pct !== undefined) controls.intensity.value = preset.intensity_pct;
         if (controls.pattern && preset.pattern_mode) controls.pattern.value = preset.pattern_mode;
-        if (controls.duration && preset.duration_ms !== undefined) controls.duration.value = preset.duration_ms;
         if (controls.name && preset.name !== undefined) controls.name.value = preset.name;
         if (controls.notes && preset.notes !== undefined) controls.notes.value = preset.notes;
         updateVisualization();
@@ -211,32 +201,38 @@ document.addEventListener('DOMContentLoaded', () => {
             return;
         }
 
-        const { intensity, duration, pattern } = currentState();
+        const { intensity, pattern } = currentState();
         const normalizedIntensity = Math.max(0, Math.min(1, intensity / 100));
-        ui.testButton.disabled = true;
-        ui.testButton.textContent = 'Testing…';
+
+        if (continuousVibrationInterval) {
+            window.clearInterval(continuousVibrationInterval);
+            continuousVibrationInterval = null;
+            ui.testButton.textContent = 'Test vibration (continuous)';
+            notify('Vibration stopped.');
+            return;
+        }
+
+        ui.testButton.textContent = 'Stop vibration';
 
         try {
             if (pattern === 'pulse') {
-                let remaining = duration;
-                while (remaining > 0) {
-                    const burst = Math.min(160, remaining);
-                    await playEffect(actuator, normalizedIntensity, burst);
-                    remaining -= burst;
-                    if (remaining > 0) {
-                        await new Promise((resolve) => window.setTimeout(resolve, 120));
-                    }
-                }
+                const pulse = async () => {
+                    await playEffect(actuator, normalizedIntensity, 500);
+                };
+                pulse();
+                continuousVibrationInterval = window.setInterval(pulse, 800);
             } else {
-                await playEffect(actuator, normalizedIntensity, duration);
+                // For continuous, we re-trigger every 100ms
+                await playEffect(actuator, normalizedIntensity, 150);
+                continuousVibrationInterval = window.setInterval(async () => {
+                    await playEffect(actuator, normalizedIntensity, 150);
+                }, 100);
             }
-            notify(`Running ${pattern} vibration at ${intensity}% for ${duration} ms.`);
+            notify(`Running ${pattern} vibration at ${intensity}%.`);
         } catch (error) {
             console.error(error);
             notify('The browser detected the controller, but vibration could not start.');
-        } finally {
-            ui.testButton.textContent = 'Test vibration';
-            refreshGamepads();
+            ui.testButton.textContent = 'Test vibration (continuous)';
         }
     };
 
@@ -248,7 +244,6 @@ document.addEventListener('DOMContentLoaded', () => {
                     angle_deg: button.dataset.angle || 0,
                     intensity_pct: button.dataset.intensity || 0,
                     pattern_mode: button.dataset.pattern || 'continuous',
-                    duration_ms: button.dataset.duration || 1000,
                     notes: button.dataset.notes || ''
                 });
                 window.location.hash = 'simulator';
@@ -268,7 +263,7 @@ document.addEventListener('DOMContentLoaded', () => {
         });
     }
 
-    [controls.angle, controls.intensity, controls.pattern, controls.duration].forEach((element) => {
+    [controls.angle, controls.intensity, controls.pattern].forEach((element) => {
         if (element) {
             element.addEventListener('input', updateVisualization);
             element.addEventListener('change', updateVisualization);
@@ -306,5 +301,8 @@ document.addEventListener('DOMContentLoaded', () => {
         if (scanTimer) {
             window.clearInterval(scanTimer);
         }
+        if (continuousVibrationInterval) {
+            window.clearInterval(continuousVibrationInterval);
+        }
     });
-});
+});
\ No newline at end of file
diff --git a/index.php b/index.php
index 862418a..21fafe1 100644
--- a/index.php
+++ b/index.php
@@ -36,7 +36,6 @@ if ($presetId) {
             'angle_deg' => (int) $selectedPreset['angle_deg'],
             'intensity_pct' => (int) $selectedPreset['intensity_pct'],
             'pattern_mode' => (string) $selectedPreset['pattern_mode'],
-            'duration_ms' => (int) $selectedPreset['duration_ms'],
             'notes' => (string) ($selectedPreset['notes'] ?? ''),
         ];
     }
@@ -125,7 +124,6 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
                 <div><span>Angle</span><strong id="summary-angle"><?= e((string) $formData['angle_deg']) ?>°</strong></div>
                 <div><span>Intensity</span><strong id="summary-intensity"><?= e((string) $formData['intensity_pct']) ?>%</strong></div>
                 <div><span>Pattern</span><strong id="summary-pattern"><?= e(ucfirst($formData['pattern_mode'])) ?></strong></div>
-                <div><span>Tone</span><strong id="summary-tone"><?= e(preset_tone((int) $formData['angle_deg'])) ?></strong></div>
               </div>
               <p class="small text-secondary mb-0 mt-3">Tip: the browser requires a user interaction before triggering vibration. Press <strong>Test vibration</strong> after connecting the controller.</p>
             </div>
@@ -164,18 +162,15 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
             </div>
 
             <div class="row g-3 stat-row">
-              <div class="col-6 col-md-3">
+              <div class="col-6 col-md-4">
                 <div class="mini-stat"><span>Recline</span><strong id="stat-angle"><?= e((string) $formData['angle_deg']) ?>°</strong></div>
               </div>
-              <div class="col-6 col-md-3">
+              <div class="col-6 col-md-4">
                 <div class="mini-stat"><span>Rumble</span><strong id="stat-intensity"><?= e((string) $formData['intensity_pct']) ?>%</strong></div>
               </div>
-              <div class="col-6 col-md-3">
+              <div class="col-6 col-md-4">
                 <div class="mini-stat"><span>Pattern</span><strong id="stat-pattern"><?= e(ucfirst($formData['pattern_mode'])) ?></strong></div>
               </div>
-              <div class="col-6 col-md-3">
-                <div class="mini-stat"><span>Duration</span><strong id="stat-duration"><?= e((string) $formData['duration_ms']) ?> ms</strong></div>
-              </div>
             </div>
           </section>
 
@@ -197,7 +192,7 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
               </div>
               <div class="col-md-5">
                 <label class="form-label d-block">Action</label>
-                <button type="button" class="btn btn-accent w-100" id="test-vibration">Test vibration</button>
+                <button type="button" class="btn btn-accent w-100" id="test-vibration">Test vibration (continuous)</button>
               </div>
             </div>
 
@@ -210,18 +205,12 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
                 <div class="d-flex justify-content-between align-items-center mb-2"><label for="intensity_pct" class="form-label mb-0">Vibration intensity</label><span class="value-pill" id="intensity-pill"><?= e((string) $formData['intensity_pct']) ?>%</span></div>
                 <input type="range" class="form-range" min="0" max="100" step="1" id="intensity_pct" name="intensity_pct" value="<?= e((string) $formData['intensity_pct']) ?>">
               </div>
-              <div class="row g-3">
-                <div class="col-md-6">
-                  <label for="pattern_mode" class="form-label">Pattern</label>
-                  <select class="form-select" id="pattern_mode" name="pattern_mode">
-                    <option value="continuous" <?= $formData['pattern_mode'] === 'continuous' ? 'selected' : '' ?>>Continuous</option>
-                    <option value="pulse" <?= $formData['pattern_mode'] === 'pulse' ? 'selected' : '' ?>>Pulse</option>
-                  </select>
-                </div>
-                <div class="col-md-6">
-                  <div class="d-flex justify-content-between align-items-center mb-2"><label for="duration_ms" class="form-label mb-0">Duration</label><span class="value-pill" id="duration-pill"><?= e((string) $formData['duration_ms']) ?> ms</span></div>
-                  <input type="range" class="form-range mt-3" min="100" max="5000" step="100" id="duration_ms" name="duration_ms" value="<?= e((string) $formData['duration_ms']) ?>">
-                </div>
+              <div class="control-group">
+                <label for="pattern_mode" class="form-label">Pattern</label>
+                <select class="form-select" id="pattern_mode" name="pattern_mode">
+                  <option value="continuous" <?= $formData['pattern_mode'] === 'continuous' ? 'selected' : '' ?>>Continuous</option>
+                  <option value="pulse" <?= $formData['pattern_mode'] === 'pulse' ? 'selected' : '' ?>>Pulse</option>
+                </select>
               </div>
             </div>
           </section>
@@ -261,7 +250,6 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
                 <div><span>Angle</span><strong id="save-angle"><?= e((string) $formData['angle_deg']) ?>°</strong></div>
                 <div><span>Intensity</span><strong id="save-intensity"><?= e((string) $formData['intensity_pct']) ?>%</strong></div>
                 <div><span>Pattern</span><strong id="save-pattern"><?= e(ucfirst($formData['pattern_mode'])) ?></strong></div>
-                <div><span>Duration</span><strong id="save-duration"><?= e((string) $formData['duration_ms']) ?> ms</strong></div>
               </div>
             </div>
 
@@ -295,7 +283,6 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
                     <div class="preset-metrics mb-3">
                       <span><?= e((string) $preset['intensity_pct']) ?>% intensity</span>
                       <span><?= e(ucfirst((string) $preset['pattern_mode'])) ?></span>
-                      <span><?= e((string) $preset['duration_ms']) ?> ms</span>
                     </div>
                     <?php if (!empty($preset['notes'])): ?>
                       <p class="text-secondary small mb-3"><?= e($preset['notes']) ?></p>
@@ -309,7 +296,6 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
                         data-angle="<?= e((string) $preset['angle_deg']) ?>"
                         data-intensity="<?= e((string) $preset['intensity_pct']) ?>"
                         data-pattern="<?= e((string) $preset['pattern_mode']) ?>"
-                        data-duration="<?= e((string) $preset['duration_ms']) ?>"
                         data-notes="<?= e((string) ($preset['notes'] ?? '')) ?>"
                       >Apply in simulator</button>
                       <a class="btn btn-sm btn-link text-decoration-none px-0" href="/preset.php?id=<?= e((string) $preset['id']) ?>">View detail</a>
@@ -347,4 +333,4 @@ if (isset($_GET['saved']) && ctype_digit((string) $_GET['saved'])) {
   <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous" defer></script>
   <script src="/assets/js/main.js?v=<?= e($assetVersion) ?>" defer></script>
 </body>
-</html>
+</html>
\ No newline at end of file
diff --git a/preset.php b/preset.php
index f472ed2..300ab29 100644
--- a/preset.php
+++ b/preset.php
@@ -64,14 +64,13 @@ $pageDescription = $preset
                 <span class="chip"><?= e((string) $preset['angle_deg']) ?>° angle</span>
                 <span class="chip"><?= e((string) $preset['intensity_pct']) ?>% intensity</span>
                 <span class="chip"><?= e(ucfirst((string) $preset['pattern_mode'])) ?> rumble</span>
-                <span class="chip"><?= e((string) $preset['duration_ms']) ?> ms</span>
               </div>
             </div>
             <div class="col-lg-4">
               <div class="panel inset-panel p-3 h-100">
                 <div class="small-label mb-3">Profile tone</div>
                 <div class="h4 mb-2"><?= e(preset_tone((int) $preset['angle_deg'])) ?></div>
-                <p class="text-secondary small mb-0">Saved on <?= e(date('F j, Y 	 H:i', strtotime((string) $preset['created_at']))) ?> UTC.</p>
+                <p class="text-secondary small mb-0">Saved on <?= e(date('F j, Y  H:i', strtotime((string) $preset['created_at']))) ?> UTC.</p>
               </div>
             </div>
           </div>
@@ -85,7 +84,6 @@ $pageDescription = $preset
                 <div><span>Recline angle</span><strong><?= e((string) $preset['angle_deg']) ?>°</strong></div>
                 <div><span>Vibration intensity</span><strong><?= e((string) $preset['intensity_pct']) ?>%</strong></div>
                 <div><span>Pattern</span><strong><?= e(ucfirst((string) $preset['pattern_mode'])) ?></strong></div>
-                <div><span>Duration</span><strong><?= e((string) $preset['duration_ms']) ?> ms</strong></div>
                 <div><span>Saved at</span><strong><?= e((string) $preset['created_at']) ?></strong></div>
               </div>
               <hr class="border-secondary-subtle my-4">
@@ -111,4 +109,4 @@ $pageDescription = $preset
     </div>
   </main>
 </body>
-</html>
+</html>
\ No newline at end of file