Full Details from Amazon.com : http://www.amazon.com/gp/product/B00LPO3C6E?tag=onigi-20
4GB KIT (2 x 2GB) For Dell Latitude ATG D620 D820. SO-DIMM DDR2 NON-ECC PC2-4200 533MHz RAM
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 Dell Latitude See Compatibility List Below