diff --git a/client/simulators/test.cpp b/client/simulators/test.cpp
index f1818e0..7c92962 100644
--- a/client/simulators/test.cpp
+++ b/client/simulators/test.cpp
@@ -15,6 +15,7 @@ Test_Sim::Test_Sim(Web_socket_wrapper *web_socket, QWidget *parent)
     push_ui_item(ui->dial);
     push_ui_item(ui->thermo);
     push_ui_item(ui->led);
+    push_ui_item(ui->checkBox);
 }
 
 Test_Sim::~Test_Sim()
diff --git a/client/simulators/test.ui b/client/simulators/test.ui
index e309743..4b2df7a 100644
--- a/client/simulators/test.ui
+++ b/client/simulators/test.ui
@@ -94,6 +94,13 @@
       </property>
      </widget>
     </item>
+    <item row="1" column="1">
+     <widget class="QCheckBox" name="checkBox">
+      <property name="text">
+       <string>CheckBox</string>
+      </property>
+     </widget>
+    </item>
    </layout>
   </widget>
   <widget class="QMenuBar" name="menubar">
diff --git a/server/simulators/test_sim.cpp b/server/simulators/test_sim.cpp
index 0b082f0..52f9dc5 100644
--- a/server/simulators/test_sim.cpp
+++ b/server/simulators/test_sim.cpp
@@ -57,6 +57,7 @@ void Test_Sim::button_clicked(UI_button *id)
         this->m_button.set_text(state ? "On" : "Off");
 
         this->m_led.set_bg_color(state ? Color::Green : Color::Red);
+        this->m_checkbox.set_state(state);
         return;
     }
 }