diff --git a/examples/OneOpenAir/OneOpenAir.ino b/examples/OneOpenAir/OneOpenAir.ino
index 3bb6fc8..240cfaf 100644
--- a/examples/OneOpenAir/OneOpenAir.ino
+++ b/examples/OneOpenAir/OneOpenAir.ino
@@ -414,6 +414,7 @@ static void wdgFeedUpdate(void) {
 
 static void ledBarEnabledUpdate(void) {
   if (ag->isOne()) {
+    ag->ledBar.setBrighness(configuration.getLedBarBrightness());
     ag->ledBar.setEnable(configuration.getLedBarMode() != LedBarModeOff);
   }
 }
@@ -721,6 +722,17 @@ static void configUpdateHandle() {
     }
   }
 
+  if (configuration.isLedBarBrightnessChanged()) {
+    ag->ledBar.setBrighness(configuration.getLedBarBrightness());
+    Serial.println("Set 'LedBarBrightness' brightness: " +
+                   String(configuration.getLedBarBrightness()));
+  }
+  if (configuration.isDisplayBrightnessChanged()) {
+    oledDisplay.setBrightness(configuration.getDisplayBrightness());
+    Serial.println("Set 'DisplayBrightness' brightness: " +
+                   String(configuration.getDisplayBrightness()));
+  }
+
   appDispHandler();
   appLedHandler();
 }
diff --git a/src/AgConfigure.cpp b/src/AgConfigure.cpp
index 1702480..ef45cb3 100644
--- a/src/AgConfigure.cpp
+++ b/src/AgConfigure.cpp
@@ -125,6 +125,15 @@ void Configuration::loadConfig(void) {
         changed = true;
         logError("LedBarMode invalid, set default: co2");
       }
+      if (config.ledBarBrightness > 100) {
+        config.ledBarBrightness = 100;
+        changed = true;
+      }
+      if (config.displayBrightness > 100) {
+        config.displayBrightness = 100;
+        changed = true;
+      }
+
       if (changed) {
         saveConfig();
       }
@@ -152,6 +161,8 @@ void Configuration::defaultConfig(void) {
   config.tvocLearningOffset = 12;
   config.noxLearningOffset = 12;
   config.temperatureUnit = 'c';
+  config.ledBarBrightness = 100;
+  config.displayBrightness = 100;
 
   saveConfig();
 }
@@ -581,6 +592,52 @@ bool Configuration::parse(String data, bool isLocal) {
     }
   }
 
+  if (JSON.typeof_(root["ledbarBrightness"]) == "number") {
+    int brightnress = root["ledbarBrightness"];
+    if (brightnress != config.ledBarBrightness) {
+      if (brightnress <= 100) {
+        changed = true;
+        configLogInfo("ledbarBrightness", String(config.ledBarBrightness),
+                      String(brightnress));
+        ledBarBrightnessChanged = true;
+        config.ledBarBrightness = (uint8_t)brightnress;
+      } else {
+        failedMessage =
+            "\"ledbarBrightness\" value invalid: " + String(brightnress);
+        return false;
+      }
+    }
+  } else {
+    if (jsonTypeInvalid(root["ledbarBrightness"], "number")) {
+      failedMessage = jsonTypeInvalidMessage("ledbarBrightness", "number");
+      jsonInvalid();
+      return false;
+    }
+  }
+
+  if (JSON.typeof_(root["displayBrightness"]) == "number") {
+    int brightness = root["displayBrightness"];
+    if (brightness != config.displayBrightness) {
+      if (brightness <= 100) {
+        changed = true;
+        displayBrightnessChanged = true;
+        configLogInfo("displayBrightness", String(config.displayBrightness),
+                      String(brightness));
+        config.displayBrightness = (uint8_t)brightness;
+      } else {
+        failedMessage =
+            "\"displayBrightness\" value invalid: " + String(brightness);
+        return false;
+      }
+    }
+  } else {
+    if (jsonTypeInvalid(root["displayBrightness"], "number")) {
+      failedMessage = jsonTypeInvalidMessage("displayBrightness", "number");
+      jsonInvalid();
+      return false;
+    }
+  }
+
   if (changed) {
     udpated = true;
     saveConfig();
@@ -643,6 +700,12 @@ String Configuration::toString(void) {
   /** "postDataToAirGradient" */
   root["postDataToAirGradient"] = config.postDataToAirGradient;
 
+  /** Led bar brighness */
+  root["ledbarBrightness"] = config.ledBarBrightness;
+
+  /** Display brighness */
+  root["displayBrightness"] = config.displayBrightness;
+
   return JSON.stringify(root);
 }
 
@@ -857,3 +920,21 @@ String Configuration::wifiSSID(void) { return "airgradient-" + ag->deviceId(); }
 String Configuration::wifiPass(void) { return String("cleanair"); }
 
 void Configuration::setAirGradient(AirGradient *ag) { this->ag = ag; }
+
+int Configuration::getLedBarBrightness(void) { return config.ledBarBrightness; }
+
+bool Configuration::isLedBarBrightnessChanged(void) {
+  bool changed = ledBarBrightnessChanged;
+  ledBarBrightnessChanged = false;
+  return changed;
+}
+
+int Configuration::getDisplayBrightness(void) {
+  return config.displayBrightness;
+}
+
+bool Configuration::isDisplayBrightnessChanged(void) {
+  bool changed = displayBrightnessChanged;
+  displayBrightnessChanged = false;
+  return changed;
+}
diff --git a/src/AgConfigure.h b/src/AgConfigure.h
index 4de0c0c..6759ba6 100644
--- a/src/AgConfigure.h
+++ b/src/AgConfigure.h
@@ -23,6 +23,8 @@ private:
     bool displayMode;             /** true if enable display */
     uint8_t useRGBLedBar;
     uint8_t abcDays;
+    uint8_t ledBarBrightness;
+    uint8_t displayBrightness;
     int tvocLearningOffset;
     int noxLearningOffset;
     char temperatureUnit; // 'f' or 'c'
@@ -36,6 +38,8 @@ private:
   String failedMessage;
   bool _noxLearnOffsetChanged;
   bool _tvocLearningOffsetChanged;
+  bool ledBarBrightnessChanged = false;
+  bool displayBrightnessChanged = false;
 
   AirGradient* ag;
 
@@ -89,6 +93,10 @@ public:
   String wifiSSID(void);
   String wifiPass(void);
   void setAirGradient(AirGradient *ag);
+  bool isLedBarBrightnessChanged(void);
+  int getLedBarBrightness(void);
+  bool isDisplayBrightnessChanged(void);
+  int getDisplayBrightness(void);
 };
 
 #endif /** _AG_CONFIG_H_ */
diff --git a/src/AgOledDisplay.cpp b/src/AgOledDisplay.cpp
index 554da78..8a033bb 100644
--- a/src/AgOledDisplay.cpp
+++ b/src/AgOledDisplay.cpp
@@ -94,6 +94,8 @@ bool OledDisplay::begin(void) {
     return false;
   }
 
+  setBrightness(config.getDisplayBrightness());
+
   isBegin = true;
   logInfo("begin");
   return true;
@@ -308,3 +310,7 @@ void OledDisplay::showWiFiQrCode(String content, String label) {
     DISP()->drawStr(x_start, 60, label.c_str());
   } while (DISP()->nextPage());
 }
+
+void OledDisplay::setBrightness(int percent) {
+  DISP()->setContrast((127 * percent) / 100);
+}
diff --git a/src/AgOledDisplay.h b/src/AgOledDisplay.h
index 2be17c8..69fb398 100644
--- a/src/AgOledDisplay.h
+++ b/src/AgOledDisplay.h
@@ -32,6 +32,7 @@ public:
   void showDashboard(void);
   void showDashboard(const char *status);
   void showWiFiQrCode(String content, String label);
+  void setBrightness(int percent);
 };
 
 #endif /** _AG_OLED_DISPLAY_H_ */
diff --git a/src/Main/LedBar.cpp b/src/Main/LedBar.cpp
index 2627d55..b00f36c 100644
--- a/src/Main/LedBar.cpp
+++ b/src/Main/LedBar.cpp
@@ -62,13 +62,13 @@ void LedBar::setColor(uint8_t red, uint8_t green, uint8_t blue, int ledNum) {
 /**
  * @brief Set LED brightness apply for all LED bar
  *
- * @param brightness Brightness (0 - 255)
+ * @param brightness Brightness (0 - 100)%
  */
 void LedBar::setBrighness(uint8_t brightness) {
   if (this->isBegin() == false) {
     return;
   }
-  pixel()->setBrightness(brightness);
+  pixel()->setBrightness((brightness * 0xff) / 100);
 }
 
 /**