Oneda 40W 19V 2.1A AC/DC Power Adapter for Samsung Series 7, 740U3E NP740U3E ; Series 9, NP900X3A, NP900X3B, NP900X4B, NP900X4C, NP900X4D Ultrabook ; P/N: AA-PA2N40L AA-PA2N40S A13-040N2A Supply Cord Input Voltage: AC 100-240V, Total output power: 40W, Output Voltage: DC 19V, Output current: 2.1A Improve the service guarantee, Satisfaction guaranteed and backed by a one year replacement warranty. Oneda new high-quality power supply adapter, a good reputation, as has always insisted on manufacturing quality products. Reliable circuit board design: overcurrent, overvoltage, overload, temperature and short circuit protection. Core security components, multiple protection and safer. Comprehensive environmental testing: to ensure the safety of products, apart from the strict implementation of 72 hours aging test, the test must also deal with a variety of physical and destruction, 100% quality assurance testing.