Callout extensions let you include additional text so you can show more detailed information about your business, products, and services, and they are places after your copy.
Think of a callout as a bullet point, rather than a complete sentence like ”Free shipping” instead of ”We have free shipping.” Shorter text means more callouts can show in your ads.
Which campaign types can use callout extensions?
Callout extensions can be added to Search Network campaigns and Search Network campaigns that have opted into the Display Network.
Callout text is limited to 25 characters in most languages, or 12 characters in double-width languages (like Chinese, Japanese, and Korean).