Went to Radio Shack today with the intention of buying a set of wireless headphones. I read on these forums where Radio Shack # 33-1253 wireless headphones would work well with metal detectors. The salesman assured me that they would not work because they relied on 110v power to work, I am at a loss. Just thought I would ask to see who uses these headphones, was the salesman just misinformed? Thanks, John