Consider an HP® 90W Smart AC Adapter, which is available with a right-angled connector, reducing cable stress, so it lasts longer. The adapter includes an optional 4.5 mm to 7.4 mm conversion dongle that plugs into an open slot on your notebook. This HP 90W smart AC adapter is an ideal replacement or back-up adapter, so you are prepared with a connection that provides optimal power. Using the adapter, you can offset fluctuations of the electrical power to your HP notebook. The adapter is compatible with some of the HP EliteBooks and HP ZBooks. The HP EliteBook AC adapter comes with overvoltage protection with 19V and 90W power, operating with smart-pin technology, which reduces the danger when there are power surges by drawing minimal power as estimated. Charging the EliteBook with the adapter and working on your device at the same time does not create any problems with the smart-pin technology. The HP 90W Smart AC adapter works with HP EliteBook 840 G1, HP EliteBook 745 G3 and HP EliteBook 1040 G3 notebook models.