Nintendo clearly has no plans to sit on the sidelines and let Sony overtake its dominant position in the portable video game market. After Sony announced a portable PlayStation PS to compete with Nintendo's market-leading Game Boy Advance, Nintendo announced a new device code-named Nintendo DS. The new device will feature two separate 3" LCD screens that will let players focus on two aspects of a game simultaneously. The system will read new unique memory cards that will feature as much as 1GB of storage space. Where this product fits in Nintendo's strategy isn't entirely clear. The system isn't designed as a successor to the company's popular Game Boy Advance; Nintendo is still working on a separate successor to that product. The video game maker will unveil the Nintendo DS design at the 2004 Electronic Entertainment Exposition (E3) trade show in May and plans to ship the device before the end of 2004.