> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/kalipso5/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/kalipso5/developing/form/actions/actions-description/group-date-time/start-timer.md).

# Start Timer

Starts a specified timer.

Action available for the following operating systems:

![](/files/-MAlQBZuuTnc6hyzKSVQ)

### Parameters

* **Timer** *\<unquoted string> -* The id of the timer that user wants to use. There are 10 handlers for timers (per form), from 1 to 10. It's also possible use a handler for timer in a dynamic way, using the value for this parameter *dynamic*.
* **Frequency** *\<numeric> -* The frequency, in milliseconds, of the timer.
* **Action Set** *\<radiobox> -* This parameter allows to choose what action set is runned when the timer is activated. It is possible to choose a **Global Action Set** or a **Local Action Set**.
* **Thread Mode** *\<checkbox> -* This parameter defines if the user wants to run the timer in thread mode or not. The possible values for this parameter are: *Yes*, *No* or *dynamic*.

{% hint style="warning" %}
If this action is executed in Thread Mode, the Actions and Variables windows in the Simulator may crash.
{% endhint %}