starry

I bought a refurbished K95 from Corsair but I got no quick start guide or any other paper work besides the packing list/invoice. I have searched for and found nothing about what the two USB plugs do--one is marked for keyboard, one has <-|-> which means what? And what functions are done on each, what current load is drawn? I have read most of the CUE manual and nothing about the keyboard connection to computer is mentioned. Thank you from a newbie Starry