diff --git a/docs/en/unit/m5camera.md b/docs/en/unit/m5camera.md
index d1f138b4..7ebfa9f7 100644
--- a/docs/en/unit/m5camera.md
+++ b/docs/en/unit/m5camera.md
@@ -121,6 +121,8 @@ Notes:
 
 1. **Camera Power Down** pin does not need to be connected to ESP32 GPIO. Instead it may be pulled down to ground with 10 kOhm resistor.
 
+<img src="assets/img/product_pics/unit/unit_m5camera_03.png" width="60%" height="60%">
+
 ## Related Link
 
 - **[Offical Video](https://www.youtube.com/channel/UCozgFVglWYQXbvTmGyS739w)**
diff --git a/docs/en/unit/rs485.md b/docs/en/unit/rs485.md
index d5eb9809..0ddff9fb 100644
--- a/docs/en/unit/rs485.md
+++ b/docs/en/unit/rs485.md
@@ -14,6 +14,7 @@
 
 ## Feature
 
+-  Built in MAX485/SP485EEN
 -  Drive RS485 devices up to 12V
 -  GROVE interface, support [UiFlow](http://flow.m5stack.com) and [Arduino](http://www.arduino.cc)
 -  Two Lego installation holes
@@ -24,7 +25,7 @@
 
 - **[Forum](http://forum.m5stack.com/)**
 
-- Datasheet - **[MAX485](https://pdf1.alldatasheet.com/datasheet-pdf/view/73463/MAXIM/MAX485.html)**
+- Datasheet - **[MAX485](https://pdf1.alldatasheet.com/datasheet-pdf/view/73463/MAXIM/MAX485.html)** - **[SP485EEN](https://pdf1.alldatasheet.com/datasheet-pdf/view/45954/SIPEX/SP485EEN.html)**
 
 ### PinMap
 
diff --git a/docs/zh_CN/unit/extio.md b/docs/zh_CN/unit/extio.md
index 812fd3a3..2c2c18ad 100644
--- a/docs/zh_CN/unit/extio.md
+++ b/docs/zh_CN/unit/extio.md
@@ -25,7 +25,7 @@
 
 - **[官方论坛](http://forum.m5stack.com/)**
 
-- [数据手册] - **[PCA9554PW](https://pdf1.alldatasheet.com/datasheet-pdf/view/86709/PHILIPS/PCA9554PW.html)**
+- 数据手册 - **[PCA9554PW](https://pdf1.alldatasheet.com/datasheet-pdf/view/86709/PHILIPS/PCA9554PW.html)**
 
 ### 管脚映射
 
diff --git a/docs/zh_CN/unit/rs485.md b/docs/zh_CN/unit/rs485.md
index ce84805d..f313598b 100644
--- a/docs/zh_CN/unit/rs485.md
+++ b/docs/zh_CN/unit/rs485.md
@@ -12,7 +12,7 @@
 
 ## 描述
 
-**<mark>RS485</mark>**是一个用于TTL电平转RS485电平的Unit，如果要控制的设备是RS485接口的话，将M5Core连接这个Unit之后，Unit就可以适配到这个设备的RS485接口，从而实现接口转换。这个Unit集成了RS-485/RS-422通信收发芯片MAX485。
+**<mark>RS485</mark>**是一个用于TTL电平转RS485电平的Unit，如果要控制的设备是RS485接口的话，将M5Core连接这个Unit之后，Unit就可以适配到这个设备的RS485接口，从而实现接口转换。这个Unit集成了RS-485/RS-422通信收发芯片MAX485/SP485EEN。
 
 ## 特性
 
@@ -26,7 +26,7 @@
 
 - **[官方论坛](http://forum.m5stack.com/)**
 
-- 数据手册 - **[MAX485](https://pdf1.alldatasheet.com/datasheet-pdf/view/73463/MAXIM/MAX485.html)**
+- 数据手册 - **[MAX485](https://pdf1.alldatasheet.com/datasheet-pdf/view/73463/MAXIM/MAX485.html)** - **[SP485EEN](https://pdf1.alldatasheet.com/datasheet-pdf/view/45954/SIPEX/SP485EEN.html)**
 
 ### 管脚映射