The Walkman A810 series is a portable music player designed by Sony Inc. It is a high end model in Walkman digital player family. The model debuted in Asia in 2007, and then became available in North America. This series update the previous Walkman A800 series, with the same hardware but different on-PC music management program. Sony also removed compatibility with ATRAC which replaced the customers need for SonicStage, with Windows Media Player 11. In March 2008, Sony launched its successor in United States, A820, featuring wireless functions and with larger LCD display and memory.