diff --git a/Home.md b/Home.md
index cd1ec19..70624a1 100644
--- a/Home.md
+++ b/Home.md
@@ -23,23 +23,26 @@ Here are certifications of our products:
 
 
 # Function comparison
-|　|PiSugar 1| PiSugar S| PiSugar S Plus | PiSugar 2| PiSugar 2 Plus|
-|----------------------------------------------------------------------------------------|------------------------------|------------------------------|------------------------------|------------------------------|------------------------------|
-| zero | Completely compatible| Completely compatible| Compatible | Completely compatible| Compatible |
-| 3A/3B/3B+/4B | Not Support| Compatible | Completely compatible| Compatible | Completely compatible|
-|Power indicator|LED|Not Support|Not Support|I2C|I2C|
-| Use while charging | Support| Support| Support| Support| Support|
-| Shut down while charging | Not Support| Support| Support| Support| Support|
-| External power-off | Cause restart| Keep working | Keep working | Keep working | Keep working |
-| External power off detection | Not Support| Support* | Support* | Support| Support|
-| Automatic power on when external power is restored (battery is not exhausted)| Support| Support| Support| Support**| Support**|
-| Automatic power on when external power is restored (battery is exhausted)| Support| Support| Support| Support| Support|
-| RTC| Not Support| Not Support| Not Support| Support| Support|
-| Timing boot| Not Support| Not Support| Not Support| Support| Support|
-| Custom button| Not Support| Support*** | Support*** | Support| Support|
-| Button to turn on| Support| Support| Support| Not Support| Not Support|
-| Button to shut down| Support| Support*** | Support*** | Support| Support|
-|Web UI|Not Support|Not Support|Not Support|Support|Support|
+
+|                                                     | PiSugar 1     | PiSugarS Series | PiSugar2 Series | PiSugar3 Series  |
+|-----------------------------------------------------|---------------|-----------------|-----------------|------------------|
+| zero                                                | Compatible    | Compatible      | Compatible      | Compatible       |
+| 3A/3B/3B+/4B                                        | Not Support   | Compatible      | Compatible      | Compatible       |
+| Data exchange                                       | Not Support   | Not Support     | I2C             | I2C              |
+| Power indicator                                     | LED           | Not Support     | Not Support     | LED              |
+| Use while charging                                  | Support       | Support         | Support         | Support          |
+| Shut down while charging                            | Not Support   | Support         | Support         | Support          |
+| External power-off                                  | Cause restart | Keep working    | Keep working    | Keep working     |
+| External power off detection                        | Not Support   | Support*        | Support         | Support          |
+| Automatic power on when external power is restored  | Support       | Support         | Support**       | Support          |
+| On board RTC                                        | Not Support   | Not Support     | Support         | Support          |
+| Timing boot                                         | Not Support   | Not Support     | Support         | Support          |
+| Custom button                                       | Not Support   | Support***      | Support         | Support          |
+| Button to turn on                                   | Support       | Support         | Not Support     | Support          |
+| Button to shut down                                 | Support       | Support***      | Support         | Support          |
+| Web UI                                              | Not Support   | Not Support     | Support         | Support          |
+| Software watchdog                                   | Not Support   | Not Support     | Not Support     | Support          |
+| Start-up watchdog                                   | Not Support   | Not Support     | Not Support     | Support          |
 
 
 *: Only supported when the automatic power-on function is turned on
@@ -47,5 +50,3 @@ Here are certifications of our products:
 **: Two independent power supplies are required
 
 ***: Refer to github function description
-
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