Hold down the button (1) for 3 seconds.
You will hear the shutdown sound. Then, the Walkman and the lamp ( 2 ) will turn off.
Yes, Sony NS-WS623 is meant for the rough usage and it is both - waterproof and dustproof.
Yes, you can connect it with phone and talk and can use as a normal Bluetooth headset.
No. It does not have remote control.
Sony NS-WS623 is available only in the Black color.