2GB STICK For Dell Vostro Notebook Series 1440 1450 1540 1550 2420 2421 2520 3350 3450 3550 3555 3560 3750 V131. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. 2GB STICK SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Vostro Notebook Series. (See Compatibility List Below)