AI-generated Key Takeaways
- 
          An AdUnitSizerepresents the size of an ad within an ad unit, including its environment and companions.
- 
          It typically consists of a width and height, but can also represent an aspect ratio. 
- 
          Key fields of AdUnitSizeincludesize,environmentType,companions,fullDisplayString, andisAudio.
- 
          Companions are only valid for ad units with the VIDEO_PLAYERenvironment type.
- 
          An audio inventory size is represented by a 1x1size andVIDEO_PLAYERenvironment type.
An AdUnitSize represents the size of an ad in an ad unit. This also represents the
            environment and companions of a particular ad in an ad unit. In most cases, it is a simple size
            with just a width and a height (sometimes representing an aspect ratio).
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Field | |
|---|---|
| 
                            | The permissible creative size that can be served inside this ad unit. | 
| 
                            | The environment type of the ad unit size. The default value is EnvironmentType.BROWSER. Enumerations 
 | 
| 
                            | The companions for this ad unit size. Companions are only valid if the environment is EnvironmentType.VIDEO_PLAYER. If the environment is EnvironmentType.BROWSER including companions results in an error. | 
| 
                            | 
                            The full (including companion sizes, if applicable) display string of the size, e.g.  | 
| 
                            | 
                            Whether the inventory size is audio. If set to true,  |