---
title: lifeSpanVariation
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/particleemittercomponent/particleemitter/lifespanvariation
---

# lifeSpanVariation

Defines a plus/minus range (in seconds) from which a value is randomly selected to offset lifeSpan. Defaults to 0.2.

## Declaration

```swift
var lifeSpanVariation: Double
```