"Thanks to Yamaha's 'AirWired' technology, an iPod . iPhone may be used with the YSP-5100 / 4100 digital sound projectors, without the need for cables. The AirWired link transmits uncompressed data, ensuring maximum sound quality. The iPod may be used as a remote control whilst listening to music, and provides synchronized power on/off. In addition, the iPod charges when fitted to the dock."