The VMU, or Visual Memory Unit (called VMS, Visual Memory System in Japan or Virtual Memory Unit), is a memory card peripheral for the Sega Dreamcast. While its most basic function is as a removable storage device the VMU may also serve as an auxiliary display during normal gameplay and, through use of additional software, act as a handheld game console. Console-like features of the VMU include a small black and white screen, speaker, directional pad, and four buttons. Also the ability to download additional games makes the VMU fall under the same jurisdiction as a game system.