api-docs/docs/browser-tracker/markdown/browser-tracker.activitytrackingconfiguration.heartbeatdelay.md
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[Home](./index.md) > [@snowplow/browser-tracker](./browser-tracker.md) > [ActivityTrackingConfiguration](./browser-tracker.activitytrackingconfiguration.md) > [heartbeatDelay](./browser-tracker.activitytrackingconfiguration.heartbeatdelay.md)
## ActivityTrackingConfiguration.heartbeatDelay property
The interval at which the callback will be fired
<b>Signature:</b>
```typescript
heartbeatDelay: number;
```