diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 207f214..b394400 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -317,10 +317,38 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
 
         self.menu.addAction(self.actionEnter_DFU_Mode)
         self.menu.addAction(self.actionNetwork_Settings)
-        self.menu.addAction(self.actionAbout_Thermostat)
         self.menu.addAction(self.actionLoad_all_configs)
         self.menu.addAction(self.actionSave_all_configs)
 
+        def about_thermostat():
+            QtWidgets.QMessageBox.about(
+                self,
+                _translate("MainWindow","About Thermostat"),
+                f"""
+                <h1>Sinara 8451 Thermostat v{self.hw_rev_d['rev']['major']}.{self.hw_rev_d['rev']['minor']}</h1>
+
+                <br>
+
+                <h2>Settings:</h2>
+                Default fan curve:
+                    a = {self.hw_rev_d['settings']['fan_k_a']},
+                    b = {self.hw_rev_d['settings']['fan_k_b']},
+                    c = {self.hw_rev_d['settings']['fan_k_c']}
+                <br>
+                Fan PWM range: 
+                    {self.hw_rev_d['settings']['min_fan_pwm']} – {self.hw_rev_d['settings']['max_fan_pwm']}
+                <br>
+                Fan PWM frequency: {self.hw_rev_d['settings']['fan_pwm_freq_hz']} Hz
+                <br>
+                Fan available: {self.hw_rev_d['settings']['fan_available']}
+                <br>
+                Fan PWM recommended: {self.hw_rev_d['settings']['fan_pwm_recommended']}
+                """
+            )
+
+        self.actionAbout_Thermostat.triggered.connect(about_thermostat)
+        self.menu.addAction(self.actionAbout_Thermostat)
+
         self.thermostat_settings.setMenu(self.menu)
 
         self.plot_menu = QtWidgets.QMenu()