diff --git a/app.py b/app.py
index 269afe1..6daed2a 100644
--- a/app.py
+++ b/app.py
@@ -256,6 +256,27 @@ async def check_all_devices():
     return RedirectResponse("/devices", status_code=303)
 
 
+@app.post("/api/devices/{device_id}/check")
+async def check_single_device(device_id: int):
+    from wled_client import get_wled_info
+    conn = database.get_db()
+    dev = conn.execute("SELECT hostname FROM wled_devices WHERE id=?", (device_id,)).fetchone()
+    if dev:
+        from datetime import datetime
+        info = get_wled_info(dev["hostname"])
+        conn.execute("""
+            UPDATE wled_devices SET online=?, leds=?, version=?, last_check=? WHERE id=?
+        """, (
+            1 if info.get("online") else 0,
+            info.get("leds", 0) if info.get("online") else 0,
+            info.get("version", "") if info.get("online") else "",
+            datetime.now(), device_id,
+        ))
+        conn.commit()
+    conn.close()
+    return RedirectResponse("/devices", status_code=303)
+
+
 # ── Assignments ────────────────────────────────────────────────────────────
 
 @app.get("/assignments", response_class=HTMLResponse)
diff --git a/templates/devices.html b/templates/devices.html
index 8311691..ebc3cf6 100644
--- a/templates/devices.html
+++ b/templates/devices.html
@@ -55,6 +55,11 @@
                                 <td>{{ device.version if device.version else '-' }}</td>
                                 <td>{{ device.segment_count }}</td>
                                 <td>
+                                    <form method="post" action="/api/devices/{{ device.id }}/check" class="d-inline">
+                                        <button type="submit" class="btn btn-sm btn-outline-secondary" title="Jetzt pruefen">
+                                            <i class="bi bi-wifi"></i>
+                                        </button>
+                                    </form>
                                     <button class="btn btn-sm btn-outline-primary" data-bs-toggle="modal"
                                             data-bs-target="#edit-{{ device.id }}">
                                         <i class="bi bi-pencil"></i>