> For the complete documentation index, see [llms.txt](https://setup.livereach.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://setup.livereach.ai/hdmi-display.md).

# HDMI Display

Connect a display to see every tunnel camera and review alerts alongside live video.

Connect an HDMI display to the **LiveReach SafeTunnel Appliance** to view all cameras in the tunnel. During normal operation, the display shows a video wall. When SafeTunnel raises an alert, it switches to a replay and live view of the alerting camera.

## Connect the display

1. Connect an HDMI cable from the **SafeTunnel Appliance** to the display.
2. Turn on the display and select the HDMI input you connected.
3. Confirm that the video wall shows all cameras in the tunnel.

## Normal operation: video wall

The video wall shows all tunnel cameras together. **All tracked vehicles are highlighted in yellow**, so you can follow vehicles through the camera views.

## Alert mode: replay and live video

When SafeTunnel raises an alert, the display switches to **alert mode** with two camera views side by side. **The vehicles that caused the alert are highlighted in red.**

<figure><img src="https://3748104918-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fcfh08s1E8Fn9MOdqduSf%2Fuploads%2FYCqYkANnbstFf5VM70Rd%2Fsample-alert-mode.png?alt=media" alt="SafeTunnel alert mode with a replay on the left and live video on the right. Red outlines identify vehicles involved in the alert; a yellow outline marks a tracked vehicle in the live view."><figcaption><p>Example alert display. Left: the 15 seconds leading up to the alert, played in a loop. Right: the live camera view.</p></figcaption></figure>

| View              | What it shows                                                                                                                              |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| **Left — replay** | The camera footage from the **15 seconds leading up to the alert**, played continuously in a loop. Use it to review what led to the alert. |
| **Right — live**  | The **live camera view**, showing what is happening now.                                                                                   |

## Clear alert mode

Alert mode can be cleared in either of these ways:

* **LiveReach AI dashboard:** clear the alert in the dashboard.
* **With a relay connected:** alert mode clears once the conveyor is started.