实现了和磁带盒一样大小的理想尺寸，通过滑动方式打开仓门放入磁带和电池，机体和磁带之间的厚度仅有6毫米。为了实现小型化，只装有一节五号电池，也就是全新设计了仅使用1.5V的电压驱动的电路。采用了5毫米超扁平马达，具有耳机插孔开关(插上耳机才能通电)功能。
新品发行价：2万7000日元/机身尺寸：109.×69.5×17.6mm/重量：180g/电源：5号电池×1节/电池续航时间：5小时(使用碱性电池)
1983 SONY wm-20’s innovative opening method realized the size of the cassette cassette Walkman
To achieve the ideal size of the same size as the tape cartridge, the door is opened by sliding into the tape and the battery, the thickness between the body and the tape is only 6 mm. In order to achieve miniaturization, only one battery no.5 is installed, which means a new circuit is designed to be driven by a voltage of only 1.5V. 5 mm super flat motor, with headphone jack switch (plug in the headphone to energize) function.
New product launch price: 27,000 yen/body size: 109.×69.5×17.6mm/ weight: 180g/ power supply: no.5 battery ×1 / battery life: 5 hours (using alkaline battery)
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