Sony WS623 has 4GB internal memory and you can further expand it up to 16GB with the help of MicroSD card.
Sony NS-WS623 is available only in the Black color.
You can check the charging status with the lamp ( 3 ).
While the battery is charging: orange when charging is complete: green
Hold down the button (1) for 3 seconds.
You will hear the shutdown sound. Then, the Walkman and the lamp ( 2 ) will turn off.
Sony NS-WS623 is quite light weight. It weighs just about 32 grams.