1GB STICK For Toshiba Toshiba Satellite A135-S4407 A135-S4417 A135-S4427 A135-S4437 A135-S4447 A135-S4457 A135-S4467 A135-S4477 A135-S4487 A135-S4488 A135-S4499 A135-S4517 A135-S4527 A135-S4637 A135-S4656 A135-S4666 A135-S4677 A135-S4727 A135-S4827 A135-S7404 A135-S7406 A135-SP300 A135-SP4016 A135-SP4048 A135-SP4058 A135-SP4088 A135-SP4108 A135-SP4146 A135-SP4796 A135-ST1311 A200-A510. SO-DIMM DDR2 NON-ECC PC2-4200 533MHz RAM Memory. Genuine A-Tech Brand. 1GB STICK 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 Toshiba Satellite. (See Compatibility List Below)