The Infineon PC-2100U-20330-C2 128MB DDR 266 CL2 16MX64 SDRAM module is a single DIMM memory module with a total capacity of 128MB. It is designed for DDR1 SDRAM technology and operates at a bus speed of PC2100U. This memory module is manufactured by Infineon in the United States. It is a reliable and efficient choice for upgrading or replacing memory modules in desktop computers or laptops for improved performance and multitasking capabilities.