A-TECH 2GB KIT 2x 1GB Toshiba Satellite A Series A135-S4517 A135-S4527 A135-S4656 A135-S4637 A135-S4666 A135-S4677 A135-S4727 A135-S4827 SO-DIMM DDR2 NON-ECC PC2-4200 533MHz RAM Memory Genuine Brand 2GB KIT (2 x 1GB) 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)