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 ).
Yes, you can connect it with phone and talk and can use as a normal Bluetooth headset.
Sony WS623 has 4GB internal memory and you can further expand it up to 16GB with the help of MicroSD card.
No. It does not have remote control.
Yes, Sony NS-WS623 does have NFC connectivity option.