J tech laser

Hello I just got a J Tech 2.8 watt laser. Have it installed but haven’t ran anything yet. I noticed a switch on the front next to the on off switch. What is this for and what position does it need to be in?

Needs to be in the up posistion. Not sure what it is for though.

Up depends on how it’s installed.

A picture would help.

I hate to be that guy, but here is the link for the instruction manual for the driver board, it will truly explain everything and I highly recommend going through it.