What's this button's functionality

[neosarchizo]

What’s this button’s functionality?
I can’t find description in the Blynk docs.

[Flopp]

That is mapping.

If you want to change range/scale for the input.

[neosarchizo]

Then which one is range?

[Flopp]

Please read more here

http://docs.blynk.cc/#widgets-common-widget-settings-data-mapping