Yes, you will get a pair of normal earbuds and a pair of swimming earbuds.
Sony WS623 has 4GB internal memory and you can further expand it up to 16GB with the help of MicroSD card.
Yes, you can connect it with phone and talk and can use as a normal Bluetooth headset.
Yes, Sony NS-WS623 does have NFC connectivity option.
Sony NS-WS623 is available only in the Black color.