diff --git a/docs/en/unit/4relay.md b/docs/en/unit/4relay.md
index 78e21012..9b967515 100644
--- a/docs/en/unit/4relay.md
+++ b/docs/en/unit/4relay.md
@@ -1,12 +1,12 @@
 # 4-Relay {docsify-ignore-all}
 
-<el-tag effect="plain">SKU:</el-tag>
+<el-tag effect="plain">SKU:U097</el-tag>
 
-<div class="product_pic"><img src=""></div>
+<div class="product_pic"><img src="assets/img/product_pics/unit/4_relay/4relay.webp"></div>
 
 ## Description
 
-**4-Relay**  is a unit integrated with 4-way relay, which is controlled by IIC. The maximum control voltage of relay is DC-28V or AC-250V, rated current is 10A, and instantaneous current can bear 16A. Each relay can be controlled independently. Each relay has a programmable status indicator.
+**4-Relay**  is a unit integrated with 4-way relay, which is controlled by IIC. The maximum control voltage of relay is AC-250V, rated current is 10A, and instantaneous current can bear 16A. Each relay can be controlled independently. Each relay has a programmable status indicator.
 
 ## Product Features
 
@@ -23,7 +23,7 @@
 ## Applications
 
 - Digital signal switching
-- Programmable 5V power switch
+- Programmable power switch
 
 ## Specification
  
@@ -34,7 +34,7 @@
    </tr>
    <tr>
       <td>Maximum input voltage</td>
-      <td>AC-250V DC-28V</td>
+      <td>AC-250V</td>
    </tr>
    <tr>
       <td>Rated current</td>
@@ -54,15 +54,14 @@
    </tr>
    <tr>
       <td>Product Size</td>
-      <td>mm</td>
+      <td>112*24*18mm</td>
    </tr>
    <tr>
       <td>Package Size</td>
-      <td>mm</td>
+      <td>124*65*20mm</td>
    </tr>
  </table>
 
-
 ## EasyLoader
 
 >EasyLoader is a concise and fast program writer, which has a built-in case program related to the product. It can be burned to the main control by simple steps to perform a series of function verification. Please install the corresponding driver according to the device type. M5Core host [Please click here to view the CP210X driver installation tutorial](en/arduino/arduino_development), M5StickC/V/T/ATOM series can be used without driver)
@@ -72,9 +71,7 @@
         <div><img src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/image/easyloader_intro.webp"></div>
         <div class="easyloader-btn">
             <a href="">Windows</a>
-            <a href="">MacOS</a>
-            <!-- <a>Linux</a>
-            <a>MacOS</a> -->
+            <a href="https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/MacOS/UNIT/EasyLoader_4Relay_Unit_for_M5Core.dmg">MacOS</a>
         </div>
     </div>
     <div>
@@ -85,7 +82,7 @@
         <a>
             <svg id="play-btn" t="1583228776634" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="4152" width="75" height="75"><path d="M512 0C229.216 0 0 229.216 0 512s229.216 512 512 512 512-229.216 512-512S794.784 0 512 0z m0 928C282.24 928 96 741.76 96 512S282.24 96 512 96s416 186.24 416 416-186.24 416-416 416zM384 288l384 224-384 224z" p-id="4153" fill="#007aff"></path></svg></a>
             <p>Description:</p>
-            <p></p>
+            <p>ButtonA switches relay number, ButtonB switches led sync/ async, Button C controls all relays</p>
         </div>
     </div>
 </div>