4GB ( 1 x 4GB Module ) DDR4 2400 MHz ( PC4-19200 ) DDR4 SO-DIMM ( 260-Pin ) Non-ECC Unbuffered Apple Mac Certified Memory RAM Upgrade Designed For Select Apple Mac Systems: iMac (for a complete list of compatible systems, see the description section) Compatible Apple Order Numbers: MNDY2LL/A / MNE02LL/A / MNE92LL/A / MNEA2LL/A / MNED2LL/A / MRT32LL/A Compatible Apple Model IDs: iMac18,2 / iMac18,3 / iMac19,2 Compatible Apple Model Numbers/EMC: A1418 (EMC 3069) / A1419 (EMC 3070) / A2116 (EMC 3195) A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase