diff --git a/firmware/cyd/media/preview.html b/firmware/cyd/media/preview.html
new file mode 100644
index 0000000..a109e0d
--- /dev/null
+++ b/firmware/cyd/media/preview.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<title>Whistle / Sound</title>
+<style>
+
+  *{box-sizing:border-box;margin:0;padding:0}
+  html,body{width:320px;height:240px;overflow:hidden;background:#000;margin:0}
+  .bezel{width:320px;height:240px;background:#1a1408}
+  .screen{width:320px;height:240px;background:#0A1016;color:#EAF0F6;font:12px/1.2 system-ui,sans-serif;position:relative;overflow:hidden}
+  .muted{color:#7A8B9C}.ok{color:#3DDC97}.bad{color:#E85D4C}.acc{color:#4FC3F7}.amber{color:#FFB74D}
+  .btn{border:0;border-radius:8px;background:#243140;color:#EAF0F6;font-weight:600}
+  .btn.acc{background:#1A4A6E}.btn.on{background:#1B5E4A}.btn.warn{background:#6B3A1E}
+
+
+  .t{position:absolute;left:0;right:0;top:8px;text-align:center;font-size:18px;font-weight:700}
+  .pin{position:absolute;left:0;right:0;top:36px;text-align:center}
+  .st{position:absolute;left:0;right:0;top:64px;text-align:center;font-size:32px;font-weight:800}
+  .lvl{position:absolute;left:0;right:0;top:108px;text-align:center;font-size:11px}
+  .bar{position:absolute;left:24px;right:24px;top:130px;height:16px;background:#2A3340;border-radius:4px;overflow:hidden}
+  .bar>i{display:block;height:100%;width:18%;background:#3DDC97}
+  .hits{position:absolute;left:0;right:0;top:158px;text-align:center}
+  .act{position:absolute;left:90px;width:140px;bottom:12px;height:44px}
+
+</style>
+</head>
+<body>
+<div class="bezel"><div class="screen" id="s">
+
+  <div class="t">Whistle / Sound</div>
+  <div class="pin muted">OUT -&gt; GPIO22  (H/L)</div>
+  <div class="st">QUIET</div>
+  <div class="lvl muted">pin: LOW  -&gt; idle</div>
+  <div class="bar"><i></i></div>
+  <div class="hits muted">hits: 7</div>
+  <button class="btn act" type="button">Reset</button>
+
+</div></div>
+</body>
+</html>
diff --git a/firmware/cyd/meta.json b/firmware/cyd/meta.json
index e543376..7040858 100644
--- a/firmware/cyd/meta.json
+++ b/firmware/cyd/meta.json
@@ -3,5 +3,16 @@
   "name": "CYD Whistle Sound Sensor",
   "summary": "3-pin whistle module on GPIO22: digital H/L detect, hit count, Reset",
   "description": "SoftSPI touch + LVGL 320x240. OUT->GPIO22 high/low (default active HIGH). QUIET/SOUND UI, debounced hits, no dB (digital only).",
-  "tags": ["sound", "whistle", "digital", "gpio22", "touch", "lvgl", "cyd"]
+  "tags": [
+    "sound",
+    "whistle",
+    "digital",
+    "gpio22",
+    "touch",
+    "lvgl",
+    "cyd"
+  ],
+  "media": {
+    "preview": "media/preview.html"
+  }
 }