4GB STICK For Asus U Series U24E U30Jc U30SD U31F U31JG U31SD U31SG U33JC U35F U35JC U36JC U36SD U36SD-RX235X U36SG U40SD U41JF U41SV U43F U43JC U43SD U44SG U45JC U46E U46SM U46SV U50F U52F U53F U53JC U53SD U56E U82U UL20FT UL30JT UL50AT UL80JT. SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Asus U Series. (See Compatibility List Below)