> For the complete documentation index, see [llms.txt](https://ilumisoft.gitbook.io/health-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ilumisoft.gitbook.io/health-system/pro-features/event-listeners.md).
# Event Listeners
The [pro version](https://assetstore.unity.com/packages/slug/250857) comes with two useful event listener components you can use to setup actions and logic right in the inspector if the health of an object changes or becomes empty.
### On Health Changed
The OnHealthChanged event gets invoked when the health of an object changes. You can add it to a GameObject by clicking **Add Component->Health System->Events->Ob Health Changed**
### On Health Empty
The OnHealthChanged event gets invoked when the health of an object changes. You can add it to a GameObject by clicking **Add Component->Health System->Events->Ob Health Empty**
