But Sony has added one key feature: the new model now supports the AAC file format, which Sony is in the process of adding to all new players.

ENGADGET: Sony NW-E005 flash Walkman with AAC support

"With AcerCloud, Acer now supports free file sharing between all of the key mobile devices, adding tremendous value to Acer customers, " said Acer President, Jim Wong.

ENGADGET: Acer updating its AcerCloud service with full Android and iOS support