LM2596 card with buttons I dont understand the meaning of...

[Teljemo]

Look at this video: http://youtu.be/LgHvbeBRNbk?list=UU3gzJ5q340VA1yf9Icxp4EA
I have this voltage regulator card.. works just fine.. with an input and output and a potentiometer in between..

but the there is a display added and 2 buttons.. when I hold the right button as you see in the clip I can change.. ehh.. something.. but I don't get what it is.. and it doesn't seem to acctually change anything in the output..

what is it I am missing here..

(you people that use Youtube, leave a comment there too.. it would warm up my small new started channel )

[sleemanj]

Go here with Chrome
http://item.taobao.com/item.htm?spm=a230r.1.14.185.XXfVrW&id=39432149790&ns=1&abbucket=9#detail
choose to translate the page and read it.  You'll get the gist.  I only skipped thorugh your video but I notice you entered the calibration mode at one point (long press on button 2).

(In summary, left button = on/off, right button = input/output voltage display, long press right button = calibration mode (left/right is up/dn then), long press again to exit calibration mode).

[Teljemo]

Thank you.. I will try this later