# Unlock a Door from a 3rd-Party Intercom System or Button

You can hook up devices, such as intercoms and buttons, into the AUX cassette of any of Verkada’s [access controllers](https://docs.verkada.com/docs/access-controllers-series-overview.pdf) and all associated unlock events are then logged in [Verkada Command](https://app.gitbook.com/s/NRq5qDDjsYNxwNzF1bcB/get-started-with-verkada-command).

All Verkada access controllers have 2 AUX inputs, located in the middle terminal block, as shown below:

![](https://134288481-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FaaHs5RfKqv9Z49mi02cC%2Fuploads%2Fgit-blob-a7805406c94ed09b7fa36626fb8bf29a321fd468%2F1b3ad7caf8043dcd7507d8810f4b130bc08e1c32.png?alt=media)

## How it works

{% stepper %}
{% step %}

#### Wire the **Normally Open (NO)** output of the external system to the first input of your access controller, using the **IN1** input, as shown in the example:

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{% endstep %}

{% step %}

#### In Verkada Command, go to **All Products** > **Devices**.

{% endstep %}

{% step %}

#### Select the access controller you want to configure.

{% endstep %}

{% step %}

#### At the top right, click **Add** and select **AUX Input**.

{% endstep %}

{% step %}

#### Follow the setup flow to configure the AUX input.

<div align="left" data-with-frame="true"><img src="https://134288481-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FaaHs5RfKqv9Z49mi02cC%2Fuploads%2Fgit-blob-a0d9f1cd5ff344f1f32bd8419102643bd664cf7b%2F4c095fc688f7c95d8b9f9a069f08281ce0f20cb3.png?alt=media" alt="" width="296"></div>

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<div align="left" data-with-frame="true"><img src="https://134288481-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FaaHs5RfKqv9Z49mi02cC%2Fuploads%2Fgit-blob-71e480001ae546ec6b3d77f9d0a5e065c0761ae5%2F4a787dd67607a8f6424cc1a0f57efb6a5b2b4389.png?alt=media" alt="" width="257"></div>
{% endstep %}

{% step %}

#### Confirm the **Settings** and click **Next**.

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{% endstep %}

{% step %}

#### When you’re finished, click **Done**.

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<div align="left" data-with-frame="true"><img src="https://134288481-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FaaHs5RfKqv9Z49mi02cC%2Fuploads%2Fgit-blob-50161a3c7787e6578847da5371f763a7faa66596%2F1a810711e69e7d14e6bf4b88008d0bd93280e71b.png?alt=media" alt="" width="299"></div>
{% endstep %}

{% step %}

#### To the right of the AUX input, click **Delete**to remove it (see example below).

<div align="left" data-with-frame="true"><img src="https://134288481-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FaaHs5RfKqv9Z49mi02cC%2Fuploads%2Fgit-blob-21ddbbc306da236d313f4b9436d3e213fceba25f%2Fc42d783be8b3cad346c4d6d2bd25b4dba0dd328f.png?alt=media" alt="" width="1504"></div>
{% endstep %}
{% endstepper %}

***

{% hint style="info" %}
**Prefer to see it in action?** Check out the [video tutorial](https://www.youtube.com/watch?v=5MqymenWMdw).
{% endhint %}

{% hint style="success" %}
**Need more help?** Contact [Verkada Support](https://app.gitbook.com/s/NRq5qDDjsYNxwNzF1bcB/need-help/contact-verkada-support).
{% endhint %}
