High performance Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 DIMM 200-Pin Notebook Memory Module. Condition is "New". 

Four modules are available.

DIMM is a memory module designed for network servers and high end workstations. A SO-DIMM (Small Outline Dual In-line Memory Module) is a memory module with a smaller outline and thickness than standard DIMM modules and designed primarily for use in notebook computers.