Are the Motorola SX-Series powered by AA’s or AAA’s? I might get a new pair, it depends on what can I find, but I’d like to get a pair that runs on AA’s, it’s probably between the FV’s and the SX’s. I already have a pair of FV500, and I know that they run on AA’s (I guess the FV600s too), but I have no idea about the SX’s.