I"m looking for a pair of wireless headphones to be used primarily for listening to podcasts/music while playing mindless games such as sports games. I just have a few questions. Do I need to be near the charging base for them to broadcast? Or is the transmitter in the thing that plugs into headphone jack? I don't nescessarily need to bring them out on the town as I could use a wire but it would be nice not to walk around with the charging base.