# Mouse

Source: https://help.malighting.com/grandMA2/en/help/key_key_mouse.html
This is grandocs, an unofficial mirror of MA Lighting documentation. For authoritative or safety-relevant information, cite the canonical page on help.malighting.com.

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The key Mouse is located in the left corner above the trackball.

![](/img/grandma2/img_mouse-key_v3-2-f3a144.png)

_Location k__ey __Mouse _

The key Mouse toggles between the selected trackball sequences. To select the trackball sequence see [User Settings](/grandma2/key_single_multi_systems_user_settings/).

If the key Mouse is:

- On – the trackball controls the mouse function.
- Blinking – the trackball controls pan and tilt for the selected fixtures or channels.
- Off – the trackball has no function.
- Off and the middle key above the trackball is on – the trackball functions as a dimmer wheel.