> For the complete documentation index, see [llms.txt](https://sayandev.gitbook.io/sayanvanish/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sayandev.gitbook.io/sayanvanish/features/proxy/velocity/sync-events.md).

# Sync Events

This feature synchronizes vanish events by periodically checking the vanish state of users and firing appropriate events.

#### `FeatureSyncEvents`

| Parameter           | Description                                         | Default Value | Possible Values      |
| ------------------- | --------------------------------------------------- | ------------- | -------------------- |
| `checkPeriodMillis` | The period (in milliseconds) to check vanish states | `50`          | Any positive integer |

**Behavior:**

* Periodically checks the vanish state of users.
* Fires `VelocityUserVanishEvent` when a user becomes vanished.
* Fires `VelocityUserUnVanishEvent` when a user becomes unvanished.