4GB ( 1 x 4GB Module ) DDR2 667 MHz ( PC2-5300 ) DDR2 SO-DIMM ( 200-Pin ) Non-ECC Unbuffered Apple Mac Certified Memory RAM Upgrade Designed For Select Apple Mac Systems: MacBook Pro, MacBook, iMac (for a complete list of compatible systems, see the description section) Compatible Apple Order Numbers: MA876LL / MA877LL / MA895LL / MA896LL / MA897LL/A / MB133LL/A / MB134LL/A / MB166LL/A / MB061LL/B / MB062LL/B / MB063LL/B / MB402LL/A / MB403LL/A / MB404LL/A / MB881LL/A Compatible Apple Model IDs: iMac7,1 / MacBook3,1 / MacBook4,1 / MacBook5,2 / MacBookPro3,1 / MacBookPro4,1 Compatible Apple Model Numbers/EMC: A1181 (EMC 2200) / A1181 (EMC 2242) / A1181 (EMC 2300) / A1224 (EMC 2133) / A1226 (EMC 2136) / A1229 (EMC 2137) / A1260 (EMC 2198) / A1261 (EMC 2199) A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase