does that only work with mile marker winches?  

na, it'll work with all brands..

it has a brain box that hooks to a constant power supply
and one wire to the hand held switch power, one for each direction. It just eliminates the cord.

mine don't like to free spool out easily anymore so I can operate the winch while pulling cable as far as it'll reach.  

i stuck my control box in the engine compartment.i closed off the hole where the plug went and stuck it in the grill.i got enough cable to go inside if need be  

Don't no about where you guys are at. But down here in Florida we have alot of swamps and water wholes we have to go through.

So in order to keep the controll box dry putting the whole thing in the cab works well.
The cordless remote looks like it would be great as well but i would still move the box inside to keep it dry.  

After having the switch for over a month, I found numerous times when it was an excellent choice. When the guy in front of you is stuck in the snow, and you need to manuver & winch at the same time. Or when you want to hold yourself from slipping on a side hill while driving. So far the in / out right at the finger tips has been great.
 

awesome!