4GB 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.<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>4GB STICK SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory</li><li>Genuine A-Tech Memory</li><li>Lifetime Warranty</li><li>Toll Free Technical Support 1-866-557-4527</li><li>Designed For Dell Vostro Notebook Series. (See Compatibility List Below)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51EN%2BGpjxOL.jpg" noproxy>