1GB STICK For Dell Latitude Series 120L 131L D120L D410 D420 D510 D520 D610 D620 D810 D820 X 1 XT. 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 Dell Latitude Series. (See Compatibility List Below)