Samsung 40W Replacement AC Adapter for Samsung Series 9 notebook model: Samsung NP900X3A-A04US, Samsung NP900X3A-A05US, Samsung NP900X3A-B01UB, Samsung NP900X3A-B01US, Samsung NP900X3A-B02US, 100% Compatible With P/N: AA-PA2N40L, BA44-00278A, AD-4019W. ***Free Notebook Parts Outlet Microfiber Adapter Pouch***.