4GB KIT 2x 2GB Toshiba Satellite A Series A105-S4344 A105-S4364 A105-S4384 A105-S4397 A105-S4547 A105-S45472 A105-SP2011 A105-SP4021 SO-DIMM DDR2 NONECC PC2-4200 533MHz RAM Memory Genuine A-Tech Brand 4GB KIT (2 x 2GB) SO-DIMM DDR2 NON-ECC PC2-4200 533MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Toshiba Satellite A Series. (See Compatibility List Below)