Callout extensions let you include additional text so you can show more detailed information about your business, products, and services. This article explains how to create, edit, remove, and schedule callout extensions.  

Before you begin

Campaign types: Callout extensions can be added to Search Network campaigns and Search Network campaigns that have opted into the Display Network.

• Keep text short: Shorter text means more callouts can show in your ads. Think of a callout as a bullet point, rather than a complete sentence. Try "Free shipping" instead of "We have free shipping." 
• Be specific: Give customers detailed information so they can decide if you have what they’re looking for. Try "34 MPG max mileage" instead of "Great fuel economy."
• Character limits: Callout text is limited to 25 characters in most languages, or 12 characters in double-width languages (like Chinese, Japanese, and Korean).

Callout extensions at the ad group level

• By default, an ad group uses callouts you've created at the account level.
• If you create callouts at the campaign or ad group levels, those will override any callouts at the account or campaign levels, respectively.
• You can also disable a callout for an ad group. This removes any callout you created in the ad group and stops any campaign-level callout from showing with those ads. In other words, no callout will show for the ad group.

Instructions

Create callout extensions 

1. Sign in to your AdWords account.
2. Choose the campaign or ad group you’d like to add callouts to, or stay at the "All campaigns" level to add callouts at the account level.
3. Click the Ad extensions tab.
4. Select View: Callout extensions from the drop-down menu.
5. Next to the “Callout settings” link, click Edit.
   • If you’re creating callouts at the ad group level, choose Use ad group callout to create callouts specifically for the ad group.
6. You'll see all the callouts that are in this account.
   • To use an existing callout, find the callout in the list and click the arrow to select it. A minimum of two callouts are required for them to show with your ad, so select at least 2–4.
   • To create a new callout, click the New button below the list of existing callouts. Enter the new callout text in the window that appears.
7. Click Save.

Edit callout extensions

1. Choose the campaign or ad group that has the callout you'd like to edit, or stay at the "All campaigns" level to edit callouts at the account level.
2. Click the Ad extensions tab.
3. Select View: Callout extensions from the drop-down menu.
4. In the “Callout extension settings” section, click Edit.
5. You'll see a list of all the callouts available. Click the arrow next to the callout you want to edit.
6. In the “Selected callouts:” list, click the pencil icon .
7. Make changes to the callout you selected.
8. Click Save. Your change will apply to the callout text for all ad groups and campaigns that share the callout.

Schedule callout extensions

1. Choose the campaign or ad group that has the callout you'd like to edit, or stay at the "All campaigns" level to edit callouts at the account level.
2. Click the Ad extensions tab.
3. Select View: Callout extensions from the drop-down menu.
4. In the “Callout extension settings” section, click Edit.
5. You'll see a list of all the extensions. Click the arrow next to the callout you want to schedule.
6. You'll see a pencil icon and a down arrow next to your callout in the Selected callouts list. Click the pencil icon .
   • Keep in mind that any change you make affects all campaigns or ad groups sharing this callout. To make the change only for this campaign, click the down arrow, then click Copy and edit.
7. In the window that appears, click the Start/end dates, scheduling section for your callout.
8. Start/end dates: Click inside the start and end date boxes to choose when the callout should appear with your ads.
9. Scheduling: Set the days of the week and times of day your callout should appear. All times are in the timezone of your account.
10. Click Save.

Remove callout extensions

1. Choose the campaign or ad group that has the callout you'd like to remove, or stay at the "All campaigns" level to remove callouts at the account level.
2. Click the Ad extensions tab.
3. Select View: Callout extensions from the drop-down menu.
4. In the “Callout extension settings” section, click the plus sign + to expand the section.
5. You'll see all the callouts in the account, campaign, or ad group. Scroll to the appropriate level, hover your cursor over the set of callouts that contains the one you'd like to remove, and click the pencil icon that appears in the upper corner.
6. Under the “Selected callout extension heading”, click the arrow next to each extension you'd like to remove from the campaign or ad group. If you're removing the callout from the account or campaign levels, this will remove the callout for all ad groups under the account or campaign, as well.
7. Click Save.

Keep in mind

• Callouts with the device preference set to mobile will be given preference over standard callouts on mobile devices.
• Standard callouts will be given preference over mobile-optimized callouts of the same type on desktop and laptop computers.
• If a campaign or ad group has only mobile-optimized callouts, these may show on desktop and laptop computers. To avoid this, we recommend having standard callouts of the same type as the mobile-optimized callouts in your campaign.

* Nguồn: Google