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索尼公司推出了据称是世界上最小的随身听—— NW－ E3，包括电池其重量也不过 45克，可以方便地放入衬衣口袋中。 NW－ E3内置了 64MB的内存用来存储歌曲，没有配备用于扩展的记忆棒插槽。另外，它只使用一节 AAA电池（其他 MP3随身听通常需要使用两节 AAA电池）。 64MB的内存
Sony introduced the allegedly the world’s smallest Walkman - NW-E3, including its weight of 45 grams but also can easily into the shirt pocket. NW-E3 has 64MB of built-in memory for storing songs and no memory stick slot for expansion. In addition, it uses only one AAA battery (other MP3 players usually require two AAA batteries). 64MB of memory