Sony NWS203FB Operation Manual page 7



To remove the player from the arm band
Pull the tab on the undersurface of the arm band's holder in the direction of the
arrow to detach the player, then release the player from the arm band's

holder .

Attaching the player with the clip
Slide the player (display facing up) on the clip.
Insert the player fully.
To remove the player from the clip
Flex open the bottom position of the clip slightly in the direction of  to detach
the player , then release the player from the clip .
 
About the serial number
The serial number provided for this player is required for the customer
registration. The number is on the rear of the player.
You can also check the serial number on this player. See  page 48 for details.