# "Notify me" widget: FAQs
Quick answers to the most common questions about how the **"Notify me" widget** works in XFlow.
Why doesn’t the "Notify me" button appear on my product page?
This usually happens for one of these reasons:
* **XFlow Helper** is not enabled in your theme
* The product or variant is **not actually out of stock**
* The product is **included in an active campaign**. *Learn more about* [*Campaigns*](/xflow-app/campaigns/create-and-launch-a-restock-campaign.md)
* Your theme uses a **custom product form** that doesn’t support auto-replacement
When is a back-in-stock email sent?
A back-in-stock email is sent when:
* Inventory changes from **out of stock → in stock**
* The product or variant becomes **fulfillable**
* The related campaign or workflow is **active**
{% hint style="warning" %}
Emails are not sent just because inventory is added — the item must be *sellable.*
{% endhint %}
Does the back-in-stock alert work for product variants?
Yes!
* Customers can subscribe to **a specific variant**
* Or choose to subscribe to **all variants** of a product
How it works:
* If a customer subscribes to a **specific variant**, they’ll be notified **only when that variant** is back in stock.
* If they subscribe to **all variants**, they’ll be notified when **any variant** becomes available.
Will customers be notified only when a product is restocked in their own country?
Yes — **if location-based notifications are enabled**.
When enabled:
* Customers are notified only when the product is restocked at the **location/country they subscribed to.**
When disabled:
* All locations share the same back-in-stock alert.
*Learn more:* [Set up notification rules for back-in-stock alerts](/xflow-app/notify-me-widget/set-up-notification-rules-for-back-in-stock-alerts.md)
Is there a limit to how many back-in-stock emails can be sent?
No hard limits from XFlow.
* Emails are sent based on actual restock events
* Volume depends on your subscriber count and inventory changes.
{% hint style="warning" %}
Your email delivery may still be subject to your email provider’s limits.
{% endhint %}
Can customers subscribe multiple times to the same product?
No.
* XFlow prevents **duplicate subscriptions** for the same product or variant.
* Once notified, the subscription is completed automatically.
Does the Notify me widget replace the Buy button?
Yes — by default.
* When a product or variant is out of stock, XFlow automatically replaces:
* Add to cart
* Buy now
***
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