# Session timeout event (Phase 2)

This builds on a feature from a previous release, *Session Timeout Event* (Phase 1). In this release, we further enhanced this feature by introducing self-service capabilities that allow flow-builders to activate and customize the timeout message flow and timing.

We added a new configuration section to Chat Flow's UI to manage the entire *Session Timeout Event* feature. You can now offer your customers a better user experience, keeping them informed when their session is about to expire while maintaining your unique brand identity.

The Session Timeout Event configuration section functions independently on the Sandbox and Production environments.

Note that the *Session Timeout Event* feature is supported only on **WhatsApp** and **SMS**.

{% hint style="info" %}
See our [detailed Chat Flow User Guide](https://guides.clickatell.com/flow/configuration/set-up-session-timeout-events) for more information.
{% endhint %}

<figure><img src="https://guides.clickatell.com/~gitbook/image?url=https%3A%2F%2F2478193595-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252FwmGaDUQBZMvcoFPmfgvf%252Fuploads%252FDanj8U362mqjfNoFgdpX%252Fimage.png%3Falt%3Dmedia%26token%3D98bcf292-2a36-4076-87c1-e0557d172ec0&#x26;width=768&#x26;dpr=4&#x26;quality=100&#x26;sign=afc7406e&#x26;sv=2" alt=""><figcaption></figcaption></figure>