Yes, Sony NS-WS623 does have NFC connectivity option.
Sony NS-WS623 is quite light weight. It weighs just about 32 grams.
No. Sony NS-WS623 does not have FM radio.
Connect the USB cable (supplied) to the USB cradle (supplied). Then, attach the Walkman to the USB cradle.
Make sure to connect the terminals ( 1 and 2 ).
Hold down the button (1) for 3 seconds.
You will hear the shutdown sound. Then, the Walkman and the lamp ( 2 ) will turn off.