The Memory Pak, much like the Rumble Pak for the Nintendo DS is a DS Option Pak that resembles a Game Boy Advance cartridge, but will not function with official Game Boy Advance hardware. When inserted into a DS's GBA slot, the Memory Pak is the DS counterpart of the Expansion Pak for the Nintendo 64 in that it adds RAM to the system. It was released on July 24, 2006 in Japan, and is only sold with the Nintendo DS Browser, which is an implementation of the Opera for Devices browser for the DS. The European release date is on October 6 2006. The North American launch date is not set (although it is widely believed, if not desired, that it will launch there).
A DS Lite version of the Expansion Pak is also available. The lite version of the Expansion Pak has the same capabilities as the standard version, the only difference is that is slighty smaller and designed to have a snug fit in the DS Lite unit rather then the standard DS.
Applications
As of July 24, 2006 only the DS Browser uses this hardware, though it is imagined that there will be future games that can make use of it.