2GB DDR2-667 (PC2-5300) RAM Memory Upgrade for the Emachines/Gateway LT Series LT21 When you purchase 4AllMemory RAM, you are safe knowing that your investment is backed by a lifetime replacement warranty and United States based telephone technical support available a phone call away! Put your trust in a company that has been in business for 12 years, not some fly by night seller you won't be able to get ahold of! 100% Guaranteed Compatible for the computer listed in the title of this ad