Yes, it does have fast charging. Charge it for just 3 minutes and it will work for another 60 minutes.
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 will get a pair of normal earbuds and a pair of swimming earbuds.
Sony NS-WS623 is quite light weight. It weighs just about 32 grams.
Yes, Sony NS-WS623 is meant for the rough usage and it is both - waterproof and dustproof.