The product is a 2GB kit of Crucial Ballistix DDR2 PC2-6400 memory modules. Each module has a capacity of 1GB, providing a total capacity of 2GB for the kit. The modules are designed with a DIMM form factor and operate at 800MHz with a voltage of 2.0V. They are equipped with ECC memory features and have a bus speed of PC2-6400 (DDR2-800). This memory kit is ideal for upgrading or replacing existing RAM modules in computers that support DDR2 SDRAM technology.