This product is a set of two Samsung 2GB DDR2 SODIMM memory modules (M470T5663QZ3-CF7). Each module has a capacity of 2GB and operates at a bus speed of PC2-6400 (DDR2-800). These modules are specifically designed for computers that use SO-DIMM memory technology, with a total of 200 pins per module. The product provides a total of 4GB of memory capacity for your computer system to utilize.