# Booster for mobile push campaign
Booster is a tool that enables automated message follow-ups within a campaign. Available in the MessageFlow panel, this feature allows you to schedule an automatic message resend within a selected timeframe (from 2 hours to 7 days) to recipients who did not open the original message. Booster is available for Email, SMS, and PUSH campaigns.
For push campaigns, the Booster function allows you to send an additional **SMS** message.
## Example use case
You’re launching a mobile push campaign promoting a product sale that ends in 7 days. After sending the campaign, you receive a delivery report. Three days before the promotion ends, an automated follow-up SMS is sent to users who didn’t open the initial message.
## Billing
Messages sent via campaigns with the Booster enabled are billed according to your account's general billing settings and your current agreement. All follow-up SMS messages will appear in the Campaign tab with the name “Booster for....”.
## Where to find the Booster option in a push campaign
The Booster option appears in the final step of creating a PUSH campaign, in the delivery summary. It is disabled by default and must be manually activated.
## Permissions for using the Booster in push campaigns
If your account does not have SMS sending enabled, the Booster option will be grayed out. A message will prompt you to contact our Sales team to activate the feature.
## Audience group
Booster recipients are selected from the audience of the original campaign. The system identifies users who, within a set timeframe (2 hours to 7 days after the main send), did not open or click the original message.
Importantly, the selection is made just before the Booster is sent. This means if a user opens or clicks the original message right before the follow-up is triggered, or if they are deleted or blocked, they will not be included in the Booster send.
The audience for the Booster message does not appear in your group list — you can find it in the campaign list report. ([View campaign list documentation](/sms/sms-campaigns/campaigns/campaign-list.md))
**The Booster will not be sent to:**
* Contacts who opened or clicked the original message
* Deleted contacts
* Blocked contacts
* Contacts without a phone number
* Groups with 0 contacts
* Groups with 100% open rate from the original campaign (in this case, Booster will be canceled and you’ll receive a notification)
* Contacts marked as "Waiting" after the main campaign (contacts with "Error" status will still be included)
## Unsubscribe Link
Unsubscribing from a Booster campaign works the same as [unsubscribing from any other campaign](/sms/sms-campaigns/settings/unsubscribe-pages.md).
{% hint style="success" %}
**Want to learn more about the capabilities of Message Booster?**
See how it works, explore its benefits, and discover how it can boost your campaign performance on the product page: [Message Booster](https://messageflow.com/message-booster/)
{% endhint %}
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