4GB KIT (2 x 2GB) For Panasonic Toughbook 19 Mk1 CF-19C D E Mk3 CF-19K L CF-19K L M Mk1 Mk2 Mk3 30 CF-30. SO-DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) SO-DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Panasonic Toughbook. (See Compatibility List Below)