A-TECH 4GB KIT (2 x 2GB) For Fujitsu-Siemens LifeBook T4210 T4215 T4220 V1010 V1020. SO-DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory. Genuine 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 Fujitsu-Siemens LifeBook. (See Compatibility List Below)