diff --git a/website/src/App.tsx b/website/src/App.tsx
index 1bb02ea..3e3829c 100644
--- a/website/src/App.tsx
+++ b/website/src/App.tsx
@@ -141,11 +141,11 @@ export default function (props: JSX.HTMLAttributes<HTMLDivElement>) {
       //   .order("created_time", { ascending: false })
       //   .limit(1);
 
-      // if (lastData1![0] == lastData2![0]) {
-      //   alert("Device offline!");
-      // } else if (lastData1![0].created_time == lastData2![0].created_time) {
-      //   alert("Device offline!");
-      // }
+      if (lastData1![0] == lastData2![0]) {
+        alert("Device offline!");
+      } else if (lastData1![0].created_time == lastData2![0].created_time) {
+        alert("Device offline!");
+      }
     }
   };