2GB PC5300 200PIN SODIMM 667MHz Module. 

lifetime exchange or repair warranty against manufacturing defects by Computer Memory SolutionsBrand 

30 DAY Money back guarantee. 

Compatible with:Acer Aspire ONE D255E-2659 ddr2Acer Aspire One 531h Series (AO531h xxx)Acer Aspire One 532h Series (AO532h xxx)Acer Aspire One 751, 751h Series (AO751h xxx)Acer Aspire One D250 Series (AOD250 xxx)Acer Aspire One D255 Series (AOD255 2107, 2509, 2520 only)Acer Aspire One D255E (AOD255E N450 Atom models only)Acer Aspire One D260 Series (AOD260-1270 only)Acer Aspire One P531 Series (AOP531h xxx)

Maximum Memory: 1 GB with Windows 7 Starter2 GB with other operating systemsExpansion: 1 Socket(s) Lifetime Warranty30 day money back guarantee