This WMC-NW20MU USB cable is used to transfer music, pictures, data between your Sony Walkman video MP3 player and PC by USB port. While transfering data to your mp3 player, it can also charge the mp3 player at the same time. It works with but not limited (check product manual) to the following Sony Walkman models: NW-A80X, NW-A800, NW-A805, NW-A806, NW-A808, NW-A808S, NW-A810, NW-A820, NW-A916, NW-A918, NW-A919, NW-S603, NW-S605, NW-S615, NW-S616F, NW-S703F, NW-S705F, NW-S706F, NW-S715F, NW-S716F, NWZ-S610, NWZ-A720, NWZ-A726, NWZ-A728, NWZ-A729, NWZ-A800, NWZ-A810, NWZ-A815, NWZ-A816, NWZ-A818, NWZ-A820 & NWZ-A826, NWZ-A828, NWZ-A828K, NWZ-A829, NWZ-A839, NWZ-A845, NWZ-A916, NWZ-A918, NWZ-A919, NWZ-E435F, NWZ-E436F, NWZ-E438F, NWZ-E439, NWZ-E440, NWZ-E443, NWZ-E443F, NWZ-E444, NWZ-E445, NWZ-S510, NWZ-S515, NWZ-S516, NWZ-S518, NWZ-S540, NWZ-S544, NWZ-S545, NWZ-610F, NWZ-S615F, NWZ-S616F, NWZ-S618F, NWZ-S630, NWZ-S636F, NWZ-S638F, NWZ-S639F, NWZ-S640F, NWZ-S644F, NWZ-S645F, NWZ-S710F, NWZ-S716F, NWZ-S718F, NWZ-S730F, NWZ-S736F, NWZ-S738F, NWZ-S739F, NWZ-S740F, NWZ-S744F, NWZ-S745F, NWZ-X1050 & NWZ-X1060 MP3 Players.