---
title: kIOFBVariableRefreshRate
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.13+]
path: kernel/1645144-anonymous/kiofbvariablerefreshrate
---

# kIOFBVariableRefreshRate

## Declaration

```occ
kIOFBVariableRefreshRate = 'vrr?'
```