4GB Digital Music Player

Model # NWZ-S616F  |   change model...
This model is also known as:
NWZS616F, NWZS616F/BM, NWZS616F/RM, NWZS616F/SM, NWZS616FBLK, NWZS616FBLKCC, NWZS616FPNK, NWZS616FRED, NWZS616FRM, NWZS616FSLV, NWZS616FSM,

Serial Number Location: On the rear of the unit.