The product is a set of four 1GB DDR2 SDRAM memory modules from Samsung, designed for desktop computers. Each module has a capacity of 1gb, and they are installed in a DIMM form factor with 240 pins. The total capacity of the memory is 4GB, and it operates at a bus speed of 2GB PC2-5300 (DDR2-667) & 2GB of PC2-6400U . The memory features ECC error correction, ensuring reliability and performance. With a lifetime manufacturer warranty, this memory kit is a dependable choice for upgrading your computer's memory capacity.