Laptop 4GB DDR2 SODIMM 200 pin 800Mhz PC2 6400 Lifetime Warranty. Seller pays return shipping if anything is wrong Well Tested. Unique design with shorter height Non ECC and Non Parity Memory Speed: 800 MHz. Supports Dual Channel 2GB 2x1GB DDR2 PC2 6400 800MHz 200 Pin SODIMM 2GB KIT