Hyundai Kona EV smart key - what does button 3 do?

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I've just got in a 2021 Hyundai Kona Electric in mid-range Premium spec and it has this four button key. But what does button 3 do? Looking in the user manual is no help either as it only shows a 3 button key. I would have assumed this button turns on the pre-conditioning, but it doesn't seem too.
One time I did long press it, the light in the Hyundai logo came on, but there was no sounds from the heat pump. However, I've since been trying and it seems to do nothing.

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