Replacement 19V 2.1A 40W AC Adapter for Samsung Series 9 Model: Samsung NP900X3A-A04US, Samsung NP900X3A-A05US, Samsung NP900X3A-B01UB, Samsung NP900X3A-B01US, Samsung NP900X3A-B02US, 100% Compatible With P/N: AD-4019W, AA-PA2N40L, BA44-00278A. ***COME WITH MICROFIBER ADAPTER POUCH!! "STONE POWER EXCLUSIVE"***