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diff --git a/docs/en/module/facesII.md b/docs/en/module/facesII.md
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@@ -15,7 +15,7 @@
 
 ## Product Features
 
-- Colorful RGB LED light bars
+- Colorful RGB LED light bars（GPIO 15)
 - Compatible with GROVE interface for easy connection
 - Compatible with FACES Kit panels
 - Rechargeable 
diff --git a/docs/zh_CN/module/facesII.md b/docs/zh_CN/module/facesII.md
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--- a/docs/zh_CN/module/facesII.md
+++ b/docs/zh_CN/module/facesII.md
@@ -15,7 +15,7 @@
 
 ## 产品特性
 
-- 多彩LED灯条显示
+- 多彩LED灯条显示（GPIO15)
 - 兼容GROVE接口易于连接
 - 兼容FACES Kit面板
 - 背部可充电设计