HappyZone USB Data Cable + Fishbone Style Keychain for Sony Walkman NWZ-E473, NWZ-E474 and NWZ-E475 MP3 Player Uses USB connection for power source. Save space for your home and office. No need to bring AC Adapter and cradle during travel, charge your device thru the USB port Light Weight, compact, stylish, convenience Fishbone Style Keychain can use it as a headset cord wrap, perfect for managing earphone cables and keeps your cables organized when not in use (headset not included)