Event device classes: add screenshot (#32991)

source/_integrations/event.markdown

@@ -80,10 +80,17 @@ action:
 
 When creating automations in the automation editor in the UI, the event types are available as a dropdown list, depending on the event entity you are using. This means you don't have to remember the different event types and can easily select them.
 
-## Device classes
+## Device class
 
 {% include integrations/device_class_intro.md %}
 
+The screenshot shows different icons representing device classes of the event entity:
+
+<p class='img'>
+<img src='/images/integrations/event/device_class_event_icons.png' alt='Screenshot showing different icons representing device classes of the event entity' />
+Example of different icons representing device classes of the event entity.
+</p>
+
 The following device classes are supported by event entities:
 
 - **None**: Generic event. This is the default and doesn't need to be set.