2GB total memory consisting of 1pc of 2GB PC2-5300 DDR2-667 200pin SODIMM Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Compatible with: Late 2006 - MA699LL/A - MacBook2,1 - A1181 - 2121 Apple MacBook "Core 2 Duo" 1.83 13" Max Memory 3 OR 4GB Sockets 2