USB Power Port Ready retractable USB charge USB cable wired specifically for the Sony Walkman S Series NWZ-S764 and uses TipExchange Cable tip wiring and power configuration is designed to Sony specification to guarantee to put your Walkman S Series NWZ-S764 into the proper charge mode for the fastest charging possible Included TipExchange Tip ensures the fastest charging by putting your phone into charge mode rather than the typicale USB data mode that every other brand does ... this attention to detail resulting in faster and more consistant USB power port charging Ever been stranded with a dead battery because your USB data cable didnt put your Sony Walkman S Series NWZ-S764 into charge mode? At Gomadic we resolved this issue ... read on below in to learn what we do different with our USB Power Port Ready cables cable expands from 2 to 34 inches in seconds (and everything in between). Simply press the integrated retraction button, and the cable effortlessly rolls back into the casing. no additional AC power required. Uses power from the USB port of the computer to charge the Sony Walkman S Series NWZ-S764.