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---
title: Backlight Behavior
sidebar_label: Backlight
---
## Summary
This page contains [backlight](../features/backlight.md) behaviors supported by ZMK.
## Backlight Action Defines
Backlight actions defines are provided through the [`dt-bindings/zmk/backlight.h`](https://github.com/zmkfirmware/zmk/blob/main/app/include/dt-bindings/zmk/backlight.h) header,
which is added at the top of the keymap file:
```
#include <dt-bindings/zmk/backlight.h>
```
This will allow you to reference the actions defined in this header such as `BL_TOG`.
Here is a table describing the action for each define:
| Define | Action |
| -------- | ---------------------------------------- |
| `BL_TOG` | Toggles the backlight on and off |
| `BL_ON` | Turn on backlight on and off |
| `BL_OFF` | Toggles the backlight feature on and off |
| `BL_INC` | Increase backlight brightness |
| `BL_DEC` | Decrease backlight brightness |
## Behavior Binding
- Reference: `&bl`
- Parameter #1: The backlight action define, e.g. `BL_TOG` or `BL_INC`
### Examples
1. Toggle backlight on/off
```
&bl BL_TOG
```
1. Increase backlight brightness
```
&bl BL_INC
```
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