> For the complete documentation index, see [llms.txt](https://docs.zephyrintel.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zephyrintel.com/customers/browse-the-customer-list/read-the-summary-cards.md).

# Read the summary cards

The summary strip at the top of the customer list gives you a quick read on your whole customer base. It shows on tablet and desktop; on phone it is hidden.

> **Screenshot placeholder:** the four summary cards above the customer list on desktop, with the **Want to improve this number?** link visible on the Aftermarket Opportunity card.

| Card                           | Shows                                                                                   | Click behavior                                                | When empty                           |
| ------------------------------ | --------------------------------------------------------------------------------------- | ------------------------------------------------------------- | ------------------------------------ |
| **Total Customers**            | Count of customers, then the number of facilities across all of them                    | None                                                          |                                      |
| **Aftermarket Opportunity**    | A total dollar estimate of parts and wear-parts revenue your organization could capture | Opens **Filters** with **Has maintenance alerts** turned on   | Shows **"No template data"**         |
| **Revenue Trend Alerts**       | Count of customers with a declining trend                                               | Opens **Filters** with **Revenue Trend** set to **Declining** | Always reads **"0 declining"** today |
| **Avg Aftermarket / Customer** | The average of the Aftermarket Opportunity value across customers                       | None                                                          | Shows **"—"**                        |

### The projection popover

On the **Aftermarket Opportunity** card, when Signal has enough data, a link reads **"Want to improve this number?"**. Click it to open a projection with two sliders, **Assets with marked spares** and **Spares with known pricing**, showing a **Projected total** if more of your equipment records and pricing were complete. The sliders start at your organization's actual percentages each time you open the popover, and moving them does not change your real data. Click outside the popover to close it.

### Notes

* The **Revenue Trend Alerts** card always shows **"0 declining"** today, regardless of how many customers actually have a declining trend.
* The **"Want to improve this number?"** link only appears when Signal has both coverage percentages available for your organization.