1GB KIT 2x 512MB Toshiba Satellite A Series A50-SP306 A55 A55-S106 A55-S1063 A55-S1065 A55-S1066 A55-S129/A55-S1291 A55-S139/A55-S1391 SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory Genuine A-Tech Brand 1GB KIT (2 x 512MB) SO-DIMM DDR NON-ECC PC2700 333MHz 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)