Sony WS623 comes with LED indicator. If it is not fully charged and require charging - it will show orange light and when it is fully charged - it will show green light.
Yes, you can connect it with phone and talk and can use as a normal Bluetooth headset.
Yes, you will get a pair of normal earbuds and a pair of swimming earbuds.
No. Sony WS623 comes with non-removable battery.
No. Sony NS-WS623 does not have FM radio.