# Unlock from 3rd-Party Intercom 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/getting-started/get-started-with-verkada-command).
All Verkada access controllers have 2 AUX inputs, located in the middle terminal block, as shown below:
## 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:**
{% 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.**
{% endstep %}
{% step %}
**Confirm the Settings and click Next.**
{% endstep %}
{% step %}
**When you’re finished, click Done.**
{% endstep %}
{% step %}
**To the right of the AUX input, click Delete to remove it (see example below).**
{% endstep %}
{% endstepper %}
***
{% hint style="info" %}
**Prefer to see it in action?** Check out the [video tutorial](https://www.youtube.com/watch?v=5MqymenWMdw).
{% endhint %}
