> For the complete documentation index, see [llms.txt](https://docs.chatlayer.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chatlayer.ai/channels/sinch-conversation-api-beta/make-the-most-of-rcs-with-carousels.md).
# Make the most of RCS with Carousels
Your Sinch Conversation API is enhanced for improved Rich Communication Services features.
Once you set up your[ Conversation API channel](/channels/sinch-conversation-api-beta/configure-your-sinch-conversation-api.md), you can make the most of your RCS capabilities inside of [**Carousels**](/buildabot/flow-logic/dialog-state/message-components.md#carousel) steps.
## Unlimited characters limit
Chatlayer doesn't enforce character limit in **Carousels** anymore, so that you can write as much as your channel allows. What you will see is the number of characters that you already entered.
{% hint style="warning" %}
Bear in mind the character limits of the [channel](broken://pages/9JjXzp8RQyrOoYDemwrm) that you are using.
{% endhint %}
## Optional images
Images in **Carousels** are now optional. You don't need them to make a Carousel card anymore.
## Variables inside buttons
You can now use [**variables**](/navigation/settings/secure-variables-gdpr.md) inside your **Carousels** buttons.
## Card sizes
You can now configure the card size of your **Carousel card.**
Configure the card size of your carousel, for each card.
{% tabs %}
{% tab title="Short" %}
The **Short** card size will appear like this:
{% endtab %}
{% tab title="Medium" %}
The **Medium** card size will appear like this:
{% endtab %}
{% tab title="Tall" %}
The **Tall** card size will appear like this:
{% endtab %}
{% endtabs %}
{% hint style="success" %}
Note that Carousels are not only available for the [RCS](/channels/sinch-conversation-api-beta/configure-your-sinch-conversation-api.md) channel, but also for Viber bot, Instagram, and [Facebook Messenger](/channels/all-channels/facebook.md). Although Facebook Messenger only allows short and medium card sizes.
{% endhint %}
---
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