The product is a kit of 2 4GB DDR2 PC2-6400 DIMM memory RAM modules from Kingston. Each module has a capacity of 2GB, making the total capacity 4GB for the kit. These memory modules are non-ECC unbuffered and have a bus speed of PC2-6400 (DDR2-800). With a form factor of DIMM and 240 pins, these memory modules are designed for high performance in computers and networking systems. Made in the United States, this product is a reliable choice for upgrading or replacing memory modules in various computing devices.