diff --git a/entry/src/main/ets/components/RecordingOverlay.ets b/entry/src/main/ets/components/RecordingOverlay.ets
index 38ba130..169ba4f 100644
--- a/entry/src/main/ets/components/RecordingOverlay.ets
+++ b/entry/src/main/ets/components/RecordingOverlay.ets
@@ -46,7 +46,7 @@ export struct RecordingOverlay {
                 .height(48 * h)
                 .borderRadius(3)
                 .backgroundColor('#FFFFFF')
-            }, (h: number, i: number) => i.toString())
+            }, (h: number, i: number) => `${i}_${h}`)
           }
           .height(52)
           .alignItems(VerticalAlign.Center)