Like it says no offense or anything but radioshack sucks for just about everything. The other day I was in one of the radio shacks in the mall I am trying to get a job at and they couldn't figure out how to get 1.1 watts of power from 1000 milli watts ac (the guy wanted dc). Later I asked the sales person why he didn't know how to do the math since it is pretty simple and he says because their trained to sell the item that is needed not figure out the components and think of how they could be arranged. Explain that to me and I'll surely take back my statement that radio shack sucks.