1GB STICK For HP-Compaq Presario Notebook Series CQ41-211AX CQ41-213AU CQ41-214AU CQ41-215AU CQ41-217AU CQ41-218AX CQ41-221AU CQ41-221LA CQ41-222AU CQ41-222AX CQ41-224LA CQ41-226LA CQ45 CQ45-100 (CTO) CQ45-101AU CQ45-101TU CQ45-101TX CQ45-101XX CQ45-102AU CQ45-102TU CQ45-102TX CQ45-102XX CQ45-103AU CQ45-103TU CQ45-103TX CQ45-104AU CQ45-104TU CQ45-104TX CQ45-105AU CQ45-105TU CQ45-105TX CQ45-106AU. SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 1GB STICK SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq Presario Notebook Series. (See Compatibility List Below)