What is this?...on the back of my X250.8?

Hi! Do someone know what this adjustments beside the XLR:s are for?
Thanks!
 

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Info from PL:
The one marked "M" is for adjusting the position of the meter wand and the one marked "L" is for adjusting the brightness of the blue meter lights.

"M" as in METER....."L" as in Light....who should have guessed!😉