Brand new official Sega Dreamcast Visual Memory Unit(VMU), in retail pack.
Also sometimes referred to(mainly in Japan) as a Visual Memory System(VMS)

Uses:
Save Dreamcast games,
Play self-contained mini games,
Display secret info during DC games,
Download & modify characters from DC games,
Trade files with other VMUs (has two-way plug/socket on top)

Also has built-in clock.

Contains 200 blocks of memory.

Package contains:
VMU,
2 lithium batteries,
Instruction manual.

Works with every Dreamcast model, including imported consoles.