diff --git a/docs/en/unit/rs485.md b/docs/en/unit/rs485.md
index c1e07dc0..b6400073 100644
--- a/docs/en/unit/rs485.md
+++ b/docs/en/unit/rs485.md
@@ -17,7 +17,7 @@ used for converting TTL level to RS485 level. If the device to be controlled onl
 ## Product Features
 
 - Built in MAX485/SP485EEN
-- output DC 5~12 V
+- input DC 12~24 V
 - Program Platform: Arduino, UIFlow(Blockly,Pyhton)
 - Two Lego-compatible holes
 
diff --git a/docs/zh_CN/unit/rs485.md b/docs/zh_CN/unit/rs485.md
index 51c5bdd8..ba14d714 100644
--- a/docs/zh_CN/unit/rs485.md
+++ b/docs/zh_CN/unit/rs485.md
@@ -13,7 +13,7 @@
 ## 产品特性
 
 - 内置 MAX485/SP485EEN
-- 输出 DC 5~12V 
+- 输入 DC 12~24V 
 - 开发平台: Arduino, UIFlow(Blockly,Pyhton)
 - 2x LEGO 兼容孔