Tested Samsung 4GB PC4-2133P DDR4 1600MHz Laptop Memory Stock Photo. Fits all the models that use DDR4 type of memory. Memory is in great working condition, single stick of 4GB. 30 Day warranty, Money Back guaranteed. Items ship within 24 hours, after payment received (unless weekend or holiday). If for some reason you are not satisfied with received item, e-mail us through eBay messages. We will be happy to assist you. If there is any problem with your purchase, PLEASE DO NOT leave negative feedback, PLEASE give us the opportunity to make it right for you. Please contact us and we will do all our best to solve the problem. Thank you. SkyTech Team.