This 1GB PC2-5300 (DDR2-667) module is designed for use in Macbooks and Macbook Pros manufactured prior to October 2008, as well as iMacs manufactured prior to 2008. Designed specifically for use in Apple computers, this module comes backed by a lifetimeFEATURES: -Made specifically for Apple/Mac products-This product will work in DDR2-667 MacBooks as well as Macbook Pro-Product is covered by our Lifetime Guaranty-Live tech support