DESC: IBM ThinkPad X Series notebooks offer ultimate mobility in a versatile ultraportable. The ThinkPad X40 provides Intel CentrinoTM mobile technology including the Intel Pentium M processor on select models, all-day battery life (up to 10 hours) on select models, and a full size keyboard in a design featuring the smallest footprint in its class. Enhancements also include the IBM Active Protection system, IBM Powered USB 2.0 Port and a Secure Digital card slot.