By working on the controller I meant fiddling around with making custom programs. I had the idea that if I took the whole kit with me I could show custom programs to someone without the coil picking up on surrounding pieces of metal. I know that these faraday cages are sold to protect cellphones and laptops from having their info stolen, and I was just wondering if the same principle would apply to this piece of equipment. Or, I suppose I could just carry around a bucket of water in which to dunk the coil if I did'nt want it to talk to the controller. I think that might work also. I just like to think about things that might work, like thinking outside the faraday box (pun intended).