iRun New Square ASUS Zenbook UX21 UX21E UX31E Series AC Adapter Charger Generic 19V-2.37A 45W 3.0X1.1mm 45W ASUS Square Wall AC Adapter 19V-2.37A, 3.0mm*1.1mm, US plug only For Asus Zenbook UX21 UX21E UX31E Series [ NOTE: DO NOT compatible with UX21A UX31A UX32A !!!] PN: ADP-45AW, N45W-01, 90-XB34N0PW00000Y, 0A001-00230000-0A200-00021000 If no suddenness, it usually takes 7-15 business days by USPS (e-Packet) for delivery from China.