diff --git a/docs/fogwise/airbox-q900/hardware-design/hardware-interface.md b/docs/fogwise/airbox-q900/hardware-design/hardware-interface.md
index a228a810d..85ca137ad 100644
--- a/docs/fogwise/airbox-q900/hardware-design/hardware-interface.md
+++ b/docs/fogwise/airbox-q900/hardware-design/hardware-interface.md
@@ -17,6 +17,12 @@ Fogwise® AIRbox Q900 集成了丰富的硬件接口，满足工业物联网、
 | 5    | 2.5GbE RJ45 WAN        | 11   | Mini PCIe 插槽         |      |                |
 | 6    | Type-C 串口控制台      | 12   | eMMC & UFS 连接器 (NC) |      |                |
 
+:::note I2S 扩展限制
+
+AIRbox Q900 未引出 I2S 接口，也未提供通用 GPIO 扩展排针。因此，即使平台 SoC 支持 I2S，也无法通过产品的标准外部接口连接 I2S 麦克风、Codec 或功放。
+
+:::
+
 ## 电源接口
 
 DC 电源输入接口，规格为内径 2.5mm、外径 5.5mm 的标准 DC 插座，极性为内正外负。支持 12V/5.4A 或更大功率的电源适配器供电。建议使用原装或符合规格的电源适配器以确保设备稳定运行。
diff --git a/i18n/en/docusaurus-plugin-content-docs/current/fogwise/airbox-q900/hardware-design/hardware-interface.md b/i18n/en/docusaurus-plugin-content-docs/current/fogwise/airbox-q900/hardware-design/hardware-interface.md
index 3010a82f7..402ae48fe 100644
--- a/i18n/en/docusaurus-plugin-content-docs/current/fogwise/airbox-q900/hardware-design/hardware-interface.md
+++ b/i18n/en/docusaurus-plugin-content-docs/current/fogwise/airbox-q900/hardware-design/hardware-interface.md
@@ -17,6 +17,12 @@ The Fogwise® AIRbox Q900 integrates a rich set of hardware interfaces to meet t
 | 5   | 2.5GbE RJ45 WAN     | 11  | Mini PCIe Slot            |     |                |
 | 6   | Type-C Console Port | 12  | eMMC & UFS Connector (NC) |     |                |
 
+:::note I2S Expansion Limitation
+
+The AIRbox Q900 does not expose an I2S interface or provide a general-purpose GPIO expansion header. Therefore, even though the platform SoC supports I2S, I2S microphones, codecs, or amplifiers cannot be connected through the product's standard external interfaces.
+
+:::
+
 ## Power Interface
 
 DC power input interface, featuring a standard DC jack with 2.5mm inner diameter and 5.5mm outer diameter, center-positive polarity. Supports power adapters of 12V/5.4A or higher. It is recommended to use the original or compatible power adapter to ensure stable operation of the device.