# Fuser Key Functions

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### Key Functions： <a href="#key-functions" id="key-functions"></a>

* 【Power】：Power switch
* 【K1】：Short press: Cycle through resolutions, 1920\*1080, 2560\*1440, 3840\*2160, 2560\*1080, 3440\*1440, factory default 1920\*1080
* 【K1】：3 Second Press: (press and hold until displayed): the current resolution and refresh rate are displayed in the upper left corner of the screen, with host information on the top and slave information on the bottom.
* 【K2】：Short press: cycle to switch the upper layer RGB cutout intensity, 0-20 levels in total, 21 levels, factory default 0 (0 also cuts out the picture)
* 【K3】：Short press: Restore the upper layer RGB cutout strength to the factory default 0
* 【K4】：Short press: turn on/off the fusion overlay function
