[Home](./index.md) > [@firebase/analytics](./analytics.md) > [ControlParams](./analytics.controlparams.md) ## ControlParams interface Standard gtag.js control parameters. For more information, see [the gtag.js documentation on parameters](https://developers.google.com/gtagjs/reference/parameter). Signature: ```typescript export interface ControlParams ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [event\_callback?](./analytics.controlparams.event_callback.md) | () => void | (Optional) | | [event\_timeout?](./analytics.controlparams.event_timeout.md) | number | (Optional) | | [groups?](./analytics.controlparams.groups.md) | string \| string\[\] | (Optional) | | [send\_to?](./analytics.controlparams.send_to.md) | string \| string\[\] | (Optional) |