While its most basic function is as a removable storage device, the VMU (aka "Virtual Memory Unit") may also serve as an auxiliary display during normal gameplay and, through the use of additional software (distributed as extras on Dreamcast GD-ROMs), acts as a handheld game console. Console-like features of the VMU include a screen, speaker, proper directional pad, four action buttons, the ability to connect and interact with other VMUs, and the ability to download additional games. Each VMU is tested, and has replaced batteries. Saved data is generally not wiped from the VMU ahead of time.
