Coiled Power Hot Sync USB Cable for the Sony Walkman NWZ-S638F with both data and charge features - Uses Gomadic TipExchange Technology Included TipExchange technology enables cable to be easily upgraded by simply switching the physical connector plug. Specific connection for the Sony Walkman NWZ-S638F is included, with additional connectors for thousands of other devices available separately. Specification: Cable length: (12 to 30 inches), Outer Shell Material: (Coiled PU), Internal Leads: 24AWG, TipExchange Connector Design (Sony Walkman NWZ-S638F Specific) No additional AC power required. Uses power from the USB port of the computer to charge the Sony Walkman NWZ-S638F Well-made, coiled construction custom built for dual sync and charge services of the Sony Walkman NWZ-S638F. Works from the standard USB data port of any PC. Coiled cable can stretch when you need it and pack compactly when not in use.