Replacement 45W AC Adapter for Asus - Zenbook Ultrabook UX31E Series Laptop: Asus ZenBook UX31E-RY012V, Asus ZenBook UX31E-RY003V, Asus ZenBook UX31E-RY009V, Asus ZenBook UX31E-XH51, 100% Compatible With P/N: 90-XB34N0PW00000Y, ADP-45AW, N45W-01, 0A001-00230000-0A200-00021000.