Yes, Sony NS-WS623 does have NFC connectivity option.
Sony NS-WS623 is available only in the Black color.
Sony NS-WS623 is quite light weight. It weighs just about 32 grams.
Hold down the button 1 for 3 seconds.
You will hear the startup sound.
When the Walkman turns on, the lamp (2) lights up.
Sony WS623 comes with LED indicator. If it is not fully charged and require charging - it will show orange light and when it is fully charged - it will show green light.