# Google tag (gtag.js) parameter reference

The following table describes the parameters you can configure using the `config`
command, set using the `set` command, or pass using the `event` command.

For more information on product-specific parameters, refer to the corresponding
documentation:

- [Google Ads conversions](https://support.google.com/google-ads/answer/7548399)
- [Google Ads remarketing](https://support.google.com/google-ads/answer/7559130)
- [Campaign Manager and Search Ads 360](https://support.google.com/dcm/partner/answer/7568534#fields)
- [Google Analytics](https://developers.google.com/analytics/devguides/collection/ga4)

## Control parameters

| Parameter | Value type | Example value | Description |
|---|---|---|---|
| `groups` | string or array of strings | 'default,vendors' | Used by the `config` command to assign a target to one or more groups. |
| `send_to` | string or array of strings | 'G-XXXXXX' | Sets the target account/property that is to receive the event data. |
| `event_callback` | function | `function() { form.submit(); }` | JavaScript callback function called when processing of an `event` command has completed. |
| `event_timeout` | integer | 2000 | Timeout used for `event_callback` in milliseconds. |