Yes, Sony NS-WS623 does have NFC connectivity option.
No. Sony NS-WS623 does not have FM radio.
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
Yes, it does have fast charging. Charge it for just 3 minutes and it will work for another 60 minutes.