是GX323的进化版，磁带速度控制(+20至-15%)被去掉了，但是配备了双倍速模式，可将磁带速度减半并使记录时间加倍。另外，传统手动收音调谐也变为更易于操作的数字式调谐。

新品发行价：1万2000日元/机身尺寸：11.0×87.0×40.0毫米/重量：190克/电源  5号电池×2节/续航时间：24小时(使用碱性电池)

2001 sony wm-gx400 2x recording + digital radio tuner FMAM recording Walkman

It is an evolved version of GX323, and the tape speed control (+20 to -15%) is removed, but it is equipped with a double speed mode, which halves the tape speed and doubles the recording time. In addition, the traditional manual radio tuning has also become easier to operate digital tuning.

New product release price: 12,000 yen / body size: 11.0 × 87.0 × 40.0 mm / weight: 190 grams / power supply No. 5 battery × 2 batteries / battery life: 24 hours (using alkaline batteries)

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