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 ).
Sony NS-WS623 is quite light weight. It weighs just about 32 grams.
No. It does not have.
Yes, Sony NS-WS623 does have NFC connectivity option.
Yes, it does have fast charging. Charge it for just 3 minutes and it will work for another 60 minutes.