Enhance your computer's performance with this high-quality EDGE Memory PC2-4200s DDR2 SDRAM Memory Module. With a capacity of 256 MB and a bus speed of PC2-4200S, this SO-DIMM memory module is perfect for your computing needs. It has 144 pins and comes with a single module. This memory module is designed for easy installation and is compatible with various laptops. It is a reliable and efficient solution for upgrading your computer's memory. With its high-quality construction and advanced technology, this memory module ensures fast and smooth performance.